WASHINGTON — President Donald Trump barged into Senate Republicans’ delicate health care negotiations Friday, declaring that if lawmakers can’t reach a deal they should simply repeal “Obamacare” right away and then replace it later on.

Trump’s tweet revives an approach that GOP leaders and the president himself considered but dismissed months ago as impractical and politically unwise. And it’s likely to further complicate Majority Leader Mitch McConnell’s task as he struggles to bridge the divide between GOP moderates and conservatives as senators leave Washington for the Fourth of July break without having voted on a health care bill as planned.

“If Republican Senators are unable to pass what they are working on now, they should immediately REPEAL, and then REPLACE at a later date!” Trump wrote.

The president sent his early-morning tweet shortly after Nebraska Republican Sen. Ben Sasse appeared on Fox News Channel’s “Fox & Friends” to talk about a letter he had sent to Trump making that exact suggestion: a vote on repealing former President Barack Obama’s health law followed by a new effort at a working out a replacement.

Trump is a known “Fox & Friends” viewer, but Republican Sen. Rand Paul of Kentucky also claimed credit for recommending the tactic to the president in a conversation earlier in the week.

“Senator Rand Paul suggested this very idea to the president,” said Paul spokesman Sergio Gor. “The senator fully agrees that we must immediately repeal Obamacare and then work on replacing it right away.”

Either way, Trump’s suggestion has the potential to harden divisions within the GOP as conservatives like Paul and Sasse complain that McConnell’s bill does not go far enough in repealing Obama’s health care law while moderates criticize it as overly harsh in kicking people off insurance roles, shrinking the Medicaid safety net and increasing premiums for older Americans.

McConnell told reporters after an event Friday in his home state of Kentucky that the health care bill remains challenging but “we are going to stick with that path.”

“It’s not easy making American great again, is it?” McConnell said.