Julián Castro went straight for the jugular during Thursday night's Democratic debate, telling former Vice President Joe Biden that when it comes to health care, "I'm fulfilling the legacy of Barack Obama, and you're not."

Castro told Biden that his health care plan would leave 10 million people without coverage, while he wants "every single American family to have a strong Medicare plan available. If they choose to hold on to strong, solid private health insurance I believe they should be able to do that, but the difference between what I support and what you support, Vice President Biden, is that you require them to opt-in, and I would not require them to opt-in." He added, "Barack Obama's vision was not to leave 10 million people uncovered. He wanted every single person in this country covered. My plan would do that, your plan would not."

Biden interjected, saying people would not have to buy-in under his plan. "Are you forgetting what you said two minutes ago?" Castro shot back, a line that earned "oooohs" from the audience. "If you lose your job, for instance, his health care plan would not automatically enroll you, you would have to opt in," Castro continued. "That's the big difference — I'm fulfilling the legacy of Barack Obama and you're not." In response, Biden muttered, "That'll be a surprise to him." Cue more "oooohs."

It appears as though it's actually Castro who forgot what happened two minutes ago, several Twitter fact-checkers said. Julie Rover, chief Washington correspondent for Kaiser Health News, tweeted that Biden's plan would actually "auto-enroll everyone under 138 percent of poverty — the population currently eligible for the Medicaid expansion in states that have adopted it."

The Daily Beast's Sam Stein also backed Biden's version of events, saying that he "re-watched the segments where Biden talked health care and it seems pretty clear to me that Castro is, well, wrong. He never said opt-in. He said that if people lose their jobs they can automatically buy into Medicare." Stein later tweeted a follow-up, revealing that "In fact, Biden at one point said the opposite: 'Anyone who can't afford it gets automatically enrolled in the Medicare-type option we have.'" Catherine Garcia

Former New York City Mayor Rudy Giuliani claims he'd "love" to be a witness in President Trump's Senate impeachment trial, reports The Hill.

Giuliani, who serves as Trump's personal lawyer, told radio talk show host John Catsimatidis: "I would love to see a trial. I'd love to be a witness — because I'm a potential witness in the trial — and explain to everyone the corruption that I found in Ukraine, that far out-surpasses any that I've ever seen before, involving Joe Biden and a lot of other Democrats."

Giuliani was allegedly involved in a push to pressure Ukraine into launching investigations into Trump's political rivals, working to dig up dirt on former Vice President Joe Biden and pushing out former Ukrainian Ambassador Marie Yovanovitch, who was reportedly viewed as an obstacle in obtaining the promise of investigations.

Democrats in Congress have called for the Senate impeachment trial, set to begin arguments this week, to include additional witnesses beyond those who testified in the House inquiry. Senate Republicans have so far declined the requests. No evidence has emerged to prove any wrongdoing by Democrats in Ukraine, but Giuliani said "I have those facts. I have those witnesses. I have documents, and I have recordings. And I would love to get them out in public." Summer Meza

House Intelligence Committee Chair Adam Schiff (D-Calif.) on Sunday accused the National Security Agency of withholding key documents from Congress related to Ukraine that could be relevant in President Trump's impeachment trial.

Speaking to ABC News, Schiff said the NSA appears "to be succumbing to pressure from the administration," also saying "there are signs that the CIA may be on the same tragic course." Schiff said the documents could be important to the central allegation of Trump's impeachment: that he abused his power by withholding Ukraine military aid to push the country into announcing investigations of his political rivals.

The NSA and CIA have not commented on Schiff's allegations, reports NBC News.

Read more at NBC News and ABC News. Summer Meza

Fox News' Chris Wallace pointed out Sen. Lindsey Graham's (R-S.C.) updated view on witnesses in a Senate impeachment trial, but Graham swore the situation is now different.

House Democrats say "evidence overwhelmingly establishes" Trump's guilt ahead of his Senate impeachment trial, set to begin arguments on Tuesday. But they want to call new witnesses to testify, including former National Security Adviser John Bolton and Lev Parnas, an associate of Rudy Giuliani. Senate Republicans have so far denied the request.

Wallace said Graham's view that new witnesses should not appear "directly contradicts what you said as a Republican House impeachment manager in 1999 during the Clinton impeachment trial." At the time, Graham said "there may be some conflict that has to be resolved by presenting live witnesses. That's what happens every day in court and I think the Senate can stand that."

"Why were witnesses okay then, but they're over the line now?" asked Wallace.

Graham blamed the "railroad job" in the House, saying witnesses were available before the House voted to impeach Trump. "If they were that important, why didn't you call them in the House? Do you need them to make your case?" The Hill reports that in some cases, witnesses were not available or willing to testify until very recently. The White House also blocked several administration officials from appearing before the House. Summer Meza

House Democrats filed a 111-page legal brief ahead of President Trump's impeachment trial, arguing he threatens national security.

The House prosecutors laid out the argument against Trump that led to his impeachment last month on charges of abuse of power and obstruction of Congress. The legal brief says "evidence overwhelmingly establishes" Trump's guilt and says the Senate "must eliminate the threat" he poses.

The White House defense team, meanwhile, has not filed its official brief, but rejected the impeachment managers' arguments as "highly partisan." Without directly addressing allegations Trump abused his power by withholding Ukrainian aid to push for a politically-motivated investigation of his rivals, the White House castigated the "lawless process" that led to his impeachment.

Read more at The Washington Post. Summer Meza

Hong Kong protesters were hit with tear gas and pepper spray after demonstrators allegedly attacked a plainclothes police officer during a mass protest, reports The Washington Post.

Demonstrations have been ongoing for months, and have recently erupted in occasional violence as pro-democracy residents continue to protest the local government. Several protesters were arrested on Sunday after tens of thousands participated in a rally in Hong Kong's central district, the largest demonstration since New Year's Day when over a million people gathered.

A plainclothes officer reportedly refused to show a rally organizer his identification card, which led to an altercation. At least three people were injured. Read more at The Washington Post. Summer Meza

Former Vice President Joe Biden on Saturday claimed Sen. Bernie Sanders' (I-Vt.) campaign had released a "doctored" video that appeared to show Biden agreeing with Republican proposals regarding Social Security.

"It's simply a lie, that video is a lie," Biden told supporters of his presidential campaign in Iowa, per NBC News. He said "Bernie's people" had circulated the video, and he's "looking for his campaign to come forward and disown it, but they haven't done it yet." Politico reported the video "was not doctored by Sanders."

The video showed Biden agreeing with former House Speaker Paul Ryan's proposal to privatize Social Security, but Biden's campaign said he called the plan "correct" sarcastically, reports Bloomberg.

Sanders' campaign said Biden should "stop dodging questions about his record" and pointed to Biden's numerous other comments on the program. Read more at NBC News and Bloomberg. Summer Meza