President Trump sits down with Congressional leaders today to discuss tax reform, which he, Senate Majority leader Mitch MicConnel and House Speaker Paul Ryan have all expressed hope will get passed by Christmas.

The House will reportedly consider a Senate Budget resolution as early as Wednesday, which, if passed will set the stage for the Republican leadership to finally tackle tax-reform legislation.

Hurdles still remain, and the continuing feud between Trump and some lawmakers in his own party could throw a monkey wrench in legislative efforts.

Republican Senator John McCain remains a wild card, with some speculating he could repeat his thumbs down performance which tanked the latest effort to scale back the Obama administration’s Affordable Care Act.

Trump’s feud with Republican Senator Bob Corker has dominated news coverage of the president’s visit to the Capitol.

Trump wrote on Twitter today that Corker is “incompetent,” shortly after Tweeting that the Senator who “couldn’t get elected dog catcher in Tennessee, is now fighting Tax Cuts.”

Both Senators Corker and McCain are not running for reelection, and as such have no need to worry about Trump’s strong support among the Republican base.

With a narrow 52-48 majority in the Senate, the Republicans are in a precarious position, at risk of alienating fiscal hawks concerned about how tax cuts could add to the budget deficit, such as Corker.