Trump disavowed the nuclear deal months earlier.
The Republican-controlled Congress faces a January 19 deadline to keep the government open.
Retiring Republicans present Democrats with a major source of opportunity. They need 24 more seats to snatch back the speaker's gavel.
President Trump has an opportunity to scrap the Iran nuclear deal this week, but analysts say he's likely to keep it alive for now.
Former Trump advisor Steve Bannon was a bane to mainstream Republican strategy, but President Trump poses his own challenges to the agenda.
Bannon out, Trump to Davos: The news out of Washington on Tuesday suggested 2018 could be a very different year for President Donald Trump.
Stopping short of using Trump's "fake news" battle cry, the Tennessee Republican says he now "understands the problem."
Sen. Bob Corker (R-Tenn.) weighs in on his vote in favor of the tax bill despite concerns about deficit challenges.
Sen. Bob Corker, R-Tenn., addresses criticisms of the mainstream media.
Dozens of lawmakers stand to reap a big windfall from a loophole in the sweeping GOP tax overhaul bill.
House Republicans approved changes to the tax code Tuesday, but a procedural snag means they will have to vote again on a final bill.
The GOP rushes toward its year-end target to pass a tax bill, despite the measure's broad unpopularity in recent polls.
The Virginia Democrat sat down with CNBC's John Harwood to discuss Trump, Russia, the GOP tax bill and more.
A measure that could benefit Americans with real estate income "was not airdropped," White House legislative director Marc Short says.
Orrin Hatch called it "categorically false" to imply that lawmakers added the provision at the last minute to appease Bob Corker.
CNBC's Jim Cramer calls out self-proclaimed deficit hawks such as Sen. Bob Corker who moved into the "yes" column.
"When you're giving stuff away, you should be able to get Democrats," Axios' co-founder and executive editor says.
The last minute provision is said to benefit those with real estate income.
CNBC's Ylan Mui reports that previous holdout Sen. Bob Corker (R-Tenn.) now supports the Republican-backed tax bill.
Sen. Bob Corker, R-Tenn, announced Friday that he will vote yes on the GOP tax reform bill.