In the wake of President Trump's national emergency declaration, some congressional Republicans are already fearing the precedent he has set.

Sen. Thom Tillis (R-N.C.) outlined these concerns in a statement Friday, criticizing Trump's "executive overreach" and saying that this will "create a new precedent that a left-wing president would undoubtedly utilize to implement their radical policy agenda."

In fact, Tillis took Republicans through a few specific hypothetical scenarios, imagining that President Bernie Sanders would declare a national emergency to "implement a radical Green New Deal," President Elizabeth Warren would do so to "shut down the banks," and President Cory Booker would "effectively end Second Amendment rights." The senator says it's "clear what kind of rabbit hole our country can go down" if national emergencies become the norm.

Tillis' argument has been a common one in Republican circles over the past few weeks, with Sen. Marco Rubio (R-Fla.) warning members of his party last month that if the national emergency is the border today, "tomorrow, the national security emergency might be climate change," per Vox.

But Trump's decision is hardly earning universal condemnation from Republicans, with Sen. Lindsey Graham (R-S.C.) saying that he stands "firmly behind" Trump's decision and Senate Majority Leader Mitch McConnell (R-Ky.) saying Trump's actions were simply "the predictable and understandable consequence of Democrats' decision to put partisan obstruction ahead of the national interest."

Not long after the news alerts were sent out about Attorney General William Barr sending his summary of Special Counsel Robert Mueller's report to Congress, another email landed in the inboxes of President Trump's supporters, this one asking for money.

With the subject line "NO COLLUSION OR OBSTRUCTION," the Trump fundraising email states that as long as donors give $5 or more "by 11:59 p.m. TONIGHT," their gift will be "QUADRUPLE MATCHED," The Guardian's Ben Jacobs reports. It starts with a false statement — that Mueller's report is a "COMPLETE EXONERATION" — and blasts Democrats, accusing them of working with "the Fake News Media for 2 years orchestrating this Nasty Witch Hunt."

Trump needs money in order to "fight back BIGGER AND BETTER THAN EVER BEFORE," and that's why he is offering the quadruple match "for my best supporters only, the ones who stood by my side through the entire Witch Hunt." Everyone who donates through this solicitation will be placed on a list, which the email states will be delivered to Trump by his campaign team. Catherine Garcia

Special Counsel Robert Mueller's team considered issuing a subpoena for President Trump to be interviewed, and discussed this with Department of Justice officials, a person with knowledge of the matter told CNN on Sunday.

They ultimately decided not to pursue a subpoena "based on the perception of the evidence and merits of the issues," CNN reports. Mueller's office spent months trying to get Trump to sit down for an interview, and finally submitted written questions to Trump last fall, asking him about things that happened prior to the 2016 election. He responded in November.

Mueller submitted his report on Russian interference in the 2016 election on Friday, and on Sunday, Attorney General William Barr sent a short letter to Congress giving his interpretation of the findings, saying Mueller did not find the Trump campaign colluded with Russia and he could not make a decision on whether Trump obstructed justice. Catherine Garcia

CNN legal analyst Jeffrey Toobin on Sunday agreed with the White House that the newly-released summary of Special Counsel Robert Mueller's report is a victory for President Trump — at least when it comes to allegations of collusion with Russia.

Toobin offered his analysis on CNN after Attorney General William Barr said that Mueller didn't find that Trump or his associates conspired with Russia to influence the 2016 presidential election. Toobin said that the report is a "total vindication of the president and his staff on the issue of collusion."

When it comes to whether Trump obstructed justice, though, this is "somewhat more complicated," Toobin observed. This is because the summary notes that while the investigation "does not conclude Trump committed a crime, it also does not exonerate him." It was Barr and Deputy Attorney General Rod Rosenstein that reached the conclusion that there was not sufficient evidence on obstruction, Toobin explains.

"That is still a vindication, but it's quite a different one than Mueller's total vindication of the president on the issue of collusion with Russia," Toobin said. He later added that although it may turn out that Barr and Rosenstein's conclusion on obstruction was the correct one, the fact that this came from "the president’s appointees" makes it a "very different thing from an independent conclusion." Watch Toobin's analysis below. Brendan Morrow

Special Counsel Robert Mueller did not definitively conclude that President Trump or his associates during his 2016 presidential campaign colluded with Russian election interference, Attorney General William Barr's letter to Congress briefing them on the matter revealed on Sunday.

That revelation has already led to the White House declaring Mueller's findings a "total and complete exoneration" of Trump.

However, the report also did not make a conclusive decision on whether or not Trump obstructed justice during the investigation. Instead, it will be up to Barr "to determine whether the conduct described in the report constitutes a crime."

So, on the obstruction front, Trump still does not appear to be completely in the clear. Tim O'Donnell

President Trump declared victory on Sunday over the findings of Special Counsel Robert Muller's investigation into 2016 election interference, which he called an "illegal takedown."

Trump spoke with reporters after Attorney General William Barr told Congress that Mueller did not find that Trump or his associates conspired with Russia to influence the election. Mueller did not reach a conclusion about whether the president obstructed justice, saying the investigation did not exonerate Trump of this crime. Barr said that he and Deputy Attorney General Rod Rosenstein concluded there was insufficient evidence.

Trump called the investigation a "complete and total exoneration," saying that "it's a shame that our country had to go through this" and that "it's a shame that your president had to go through this." He also called the investigation an "illegal takedown that failed" and said that now "hopefully somebody is going to be looking at the other side." Watch Trump's comments on the Mueller report below. Brendan Morrow

House Judiciary Chair Jerrold Nadler (D-N.Y.) isn't completely convinced of President Trump's self-described exoneration.

Special Counsel Robert Mueller delivered his investigation of the Trump campaign's conduct surrounding Russian election interference to Attorney General Barr on Friday. On Sunday, Barr shared preliminary conclusions from the report with congressional Judiciary Committees, notably saying that Mueller's report "did not find that the Trump campaign or anyone associated with it conspired or coordinated with Russia in its efforts to influence the 2016 U.S. presidential election."

Still, Barr conceded that Trump "may have acted to obstruct justice," as Nadler put it in a series of tweets after receiving the letter. And while Barr said there wasn't enough evidence to charge Trump on that crime, Nadler's tweets implied that he'd like Barr to take a bit more time before drawing that conclusion, since Barr said he's still reviewing Mueller's report. Nadler also pledged to call Barr to testify before his committee "in the near future."

Read what's in Barr's letter to Congress here. Kathryn Krawczyk