The chambers are at odds about the best way to approach President Trump's legislative priorities, which could set them up for a showdown.

The showdown between House and Senate Republicans is escalating as the two groups barrel ahead with their contrasting strategies to pass President Trump’s legislative agenda — with the upper chamber expected to move this week.

President Donald Trump threw a major wrench into Senate Majority Leader John Thune’s planned vote later this week on the Senate GOP’s budget blueprint by endorsing the House’s blueprint instead, POLITICO’s Jordain Carney and Meredith Lee Hill report.