When President Trump signed his executive order on Wednesday to start construction on his border wall along the U.S.-Mexico border, one of the big questions was where the money will come from. Trump has long promised he will somehow get Mexico to pay for building the wall, though he has recently switched to promising Mexico will reimburse U.S. taxpayers. Mexican President Enrique Peña Nieto reiterated on Wednesday that Mexico will do no such thing. On MSNBC Wednesday evening, House Speaker Paul Ryan said taxpayers will foot the bill, at least for now, and agreed it will cost them billions.

"Well, first off, we're going to pay for it and front the money up," he told Greta Van Susteren. "There are a lot of different ways of getting Mexico to contribute to doing this, and there are different ways to defining how exactly they pay for it. Point is, he has a promise he made to the American people, which is to secure our border — a wall is a big part of that. We agree with that goal, and we will be working with him to finance construction of the physical barrier, including the wall, on the southern border."

"The law is already on the books — I voted for it like 10 years ago — but nothing has gotten done, and now we have a president who actually wants to secure the border," Ryan said. "I think a lot of people want to secure the border, on both sides of the aisles," Van Susteren said, "but the estimates are $8 billion to $14 billion..." "That's about right," Ryan agreed.

The 2006 law Ryan is referring to, the Secure Fence Act, authorized the construction of 700 miles of fencing along the U.S.-Mexico border, and the Bush and Obama administrations built along 652 of those miles; Congress would not only have to appropriate the money — an independent study estimated the cost at up to $25 billion — but also authorize construction of more barriers. The U.S. has already spent more than $7 billion on border fencing, and not only will a new wall add significantly to those costs, the roads built to construct the wall may well help drug and human traffickers experts say will find ways to circumvent any wall, anyway. Peter Weber

After holding the lead for a week, Rep. Mimi Walters (R-Calif.) is now trailing her Democratic challenger in Southern California 45th congressional district, Democratic law professor Katie Porter, by 261 votes.

Orange County released its latest ballot count on Tuesday evening. Walters was ahead of Porter by three percent on Election Day last Tuesday, but by Monday, her lead had dropped to 1,000. The Los Angeles Times says that typically in California, the last ballots counted are provisional or mailed late, and those usually favor Democrats.

In races that have been called, Democrats won three of 14 seats held by Republicans in California. Catherine Garcia

If Jennifer Senior could go back to the summer of 2017, she would have written a very different review of the book Conscience of a Conservative.

Senior, now a New York Times opinion columnist, was a book critic when Sen. Jeff Flake (R-Ariz.) released his tome. In the Times on Tuesday, Senior writes that she gave the book a "mostly kind review," but now, she's "seriously reconsidering" it. Flake has "always been a class act," Senior said, and she applauded him for being the first Republican senator to "call President Trump the domestic and international menace that he is." But while Flake loudly asserted that he was standing up to Trump, he still went along and voted with the president 84 percent of the time. "Jeff Flake's book couldn't even convince Jeff Flake," Senior said.

Flake may have said he really, truly believed Trump posed a threat to democracy, but his voting record paints a different picture. Flake had ample opportunities to "align himself with the opposition," like the late Sen. John McCain (R-Ariz.), who voted against repealing the Affordable Care Act. Instead, he said he had misgivings about Supreme Court Justice Brett Kavanaugh, yet still voted to confirm him. Trump is now the face of the Republican Party, Senior said, which is "heavy with nativists, populists, protectionists, assorted supremacists." Flake has urgently called for a return to the party's roots, but that has had "zero effect," and instead of his book being a critique of Trump, it "was a tragedy." Catherine Garcia

President Trump spent much of his Monday meeting with his legal team, going over questions from Special Counsel Robert Mueller and writing out responses, people close to Trump told ABC News Tuesday.

Mueller is investigating Russian interference in the 2016 presidential election and possible ties between the Trump campaign and Russian officials, and his questions for Trump center around Russian meddling, ABC News reports. Trump and his lawyers were expected to work on his responses during a Tuesday meeting as well.

So far, 32 people have been indicted by Mueller, with six pleading guilty — including Trump's former campaign chairman Paul Manafort and former National Security Adviser Michael Flynn — and three sentenced to prison. Catherine Garcia

On Tuesday, Florida Democratic Sen. Bill Nelson's campaign filed a federal lawsuit to extend the statewide recount of last week's Senate race.

Nelson ran against Florida's current governor, Republican Rick Scott. Scott has a slight lead over Nelson, ahead by just .14 percent. By Florida law, when the top two candidates are within half a percentage point, counties must conduct a machine recount. That's been the case this month in the governor, U.S. Senate, and agriculture commissioner races.

The deadline for the recount is 3 p.m ET Thursday, which the Palm Beach County elections supervisor has said will be "impossible to meet," USA Today reports. Nelson's campaign said the lawsuit "seeks to allow all local elections officials in the 67 Florida counties the time they say is needed to finish a legally mandated and accurate recount because the race was so close." Catherine Garcia

When the House's newest members are sworn in this January, they'll join what will become the most diverse Congress in U.S. history. But most of that diversity, it seems, is coming from one side of the aisle.

With a wave of women and people of color winning their races last week, Democrats will have a majority in the 116th Congress, which is more than 60 percent "women, minorities and LGBTQ representatives," reports The Associated Press. Republicans' new House coalition, meanwhile, is nearly entirely white. A set of headshots shared by The Washington Post's Erica Werner makes that contrast very obvious.

Despite the increasingly diverse ranks, the majority of incoming House Democrats — 131 of the 228 decided seats, or 57 percent — are white, per USA Today. And of the 198 incoming Republicans, 191 are white, 96 percent.

Top House aides are actually less racially diverse than the legislators they work for, The New York Times reported. Just 13.7 percent of House staffers are people of color, a fact that likely prompted House Minority Leader Nancy Pelosi (D-Calif.) to launch a House diversity office on Thursday. It'll "help recruit and retain diverse employees to work in Congress," a Pelosi aide tells AP, and could be voted on as soon as the next Congress takes its seats. Kathryn Krawczyk

Juul announced on Tuesday that it will temporarily halt the sale of its flavored nicotine pods in all retail stores and will discontinue its social media promotions.

The e-cigarette company has conceded to mounting pressure from the Food and Drug Administration, as it completes the process of regulating the sales of e-cigarettes in convenience stores and gas stations, reports The New York Times. The hope is to curb the rise of teen vaping.

As of Tuesday morning, Juul has stopped accepting retail orders for its mango, fruit, creme, and cucumber flavored pods to over 90,000 retail stores. CNBC reports that customers are still able to buy all Juul flavors on its website, while the four tobacco and menthol-flavored pods remain in stores.

In a statement posted on the San Francisco-based company's website, CEO Kevin Burns addressed the purpose of this change. "By deterring social media promotion of the Juul system by exiting our accounts, we can better prevent teens and non-smokers from ever becoming interested in the device," he said.

The FDA is still set to release its proposal later this week, outlining strict requirements for age verification of online sales and restricting sales of cartridge-based flavored e-cigarettes to shops. “Our intent was never to have youth use Juul," said Burns. "But intent is not enough. The numbers are what matter and the numbers tell us underage use of e-cigarettes is a problem.” Amari Pollard