WASHINGTON — Senate Republican leaders scrambled Sunday to rally support for their health care bill even as opposition continued to build outside Congress and two Republican senators questioned whether the bill would be approved this week.

President Trump expressed confidence that the bill to repeal the guts of the Affordable Care Act would be approved.

“Health care is a very, very tough thing to get,” Mr. Trump said Sunday on the Fox News Channel. “But I think we’re going to get it. We don’t have too much of a choice, because the alternative is the dead carcass of Obamacare.”....

...But the bill’s supporters were battling a dire internal threat: reluctant Republicans. Senator Ron Johnson, Republican of Wisconsin, said Sunday that “there’s no way we should be voting” on the legislation this week. “No way.”