PHILADELPHIA — Congressional Republicans, at their annual policy retreat, welcomed a speech from President Donald Trump endorsing their goals on repealing and replacing former President Barack Obama’s health care law and overhauling the loophole-ridden tax code.

But the president’s comments on paying for a border wall, and subsequent walk-backs from the White House, sowed confusion Thursday.

After the White House press secretary announced a 20 percent border tax on imports from Mexico, House Republicans felt certain the administration was describing a central plank of their own tax plan — a border adjustment that taxes imports instead of exports. They argued it would more than pay for the wall and would end up with Mexico footing the bill.

But Senate Republicans, who are not sold on the House GOP tax plan, raised questions.

Then the White House walked the idea back, saying it was simply part of a menu of options.

“Many unanswered questions about proposed ‘border adjustment’ tax,” the No. 2 Senate Republican, John Cornyn of Texas, said over Twitter.

“It’s obvious we have an awful lot of work to be done,” said Sen. Susan Collins, R-Maine. “There’s not necessarily consensus on it, but there is a sense of excitement about it.”