Trump's comments, during a White House lunch with a group of 15 GOP senators from across the ideological spectrum, signaled that he may be willing to embrace a less-aggressive revision of the Affordable Care Act than Republicans have previously promised.
Senate GOP leaders are now writing their healthcare bill, though Democrats and even some fellow Republicans have not seen any of the legislative text. They spoke on condition of anonymity to reveal a closed-door conversation.
MacArthur's office did not immediately respond to a request for comment on Trump's description of the bill MacArthur helped resuscitate.
Senate Republicans are now working on legislation after the House passed a healthcare bill in early May.
Trump accused congressional Democrats of obstruction and said they would not provide even one vote for "the best plan ever".
Their descriptions of Trump's words differed slightly.
Another congressional source said Trump used a vulgar phrase to describe the bill and urged the senators to make it "more generous". Such a failure would not get him a party on the White House lawn, but he and his colleagues could head home to their summer recess and tell constituents that, gosh darn it, they would have killed Obamacare if those pesky Democrats had not obstructed them.
GOP senators said Wednesday they remained divided over pivotal questions about dismantling and replacing chunks of former President Barack Obama's health care overhaul.
The final version of that bill was the one that passed the House in the dead of night - Republicans purposely scheduled the vote to begin at 1 a.m. In all, 20 Republicans voted against the AHCA and it squeaked through the House by a vote of 217-213.
A Cruz confidant, House Freedom Caucus Chairman Mark Meadows, R-N.C., said it is a hard choice. Trump is still most anxious about Trump, which is why he will continue to praise a piece of legislation in public that he's trashing in private. The degree to which it alters the house bill at all is unknown, but whatever it is, Republicans are doing everything they can to prevent you from finding out more.
Trump praised the bill when it passed the House in early May.
"That may be adding additional money into it", he reportedly said.
This comes after years of Republican complaints that the ACA ("Obamacare") was "rushed" through for approval.
"Let's be blunt. It is insane to pretend to have a bipartisan hearing on lowering drug prices when right now, today, 13 Republicans are writing a secret bill to kick 23 million people off health insurance and their prescription drug benefits".
"He wasn't prescribing deadlines, because I think he recognized what happened in the House wasn't good, and he wants to make sure that we have a process that proceeds in an orderly way", said Sen.