House Speaker Paul Ryan is not ready to endorse Donald Trump for president, contrary to claims made by the presumptive nominee's campaign to Republican lawmakers.

The speaker's office Wednesday scrambled to contradict reports citing Trump's campaign chairman Paul Manafort, who reportedly told GOP lawmakers the Wisconsin Republican was prepared to set aside his hesitance to offer Trump his blessing.

"We've not told the Trump campaign to expect an endorsement," Ryan spokeswoman AshLee Strong said in a statement. "He's also not told anyone he regrets anything."

Ryan, the party's highest-ranking elected official, was reportedly taken off guard when the former reality television star all but wrapped up the nomination earlier this month.

Since announcing he was "just not ready" to endorse Trump, Ryan and his staff have met several times with Trump in an effort to secure assurances the presumptive nominee was sufficiently conservative.

While Ryan remained officially neutral throughout the GOP primary, he occasionally spoke out against some of Trump's more inflammatory rhetoric and his inability – or unwillingness – to tamp down the violence that has marred a number of his campaign rallies.

When Manafort was brought on board the campaign earlier this spring, essentially replacing Trump's controversial campaign manager Corey Lewandowski, he reassured skittish party officials the brash businessman was "projecting an image" and would take on a more presidential demeanor when he moved into the general election.

But since then, Trump has doubled down on the freewheeling style that flummoxed his Republican rivals.

At a rally in New Mexico Tuesday, he flung insults at the state's Republican Gov. Susana Martinez, a Latina, who has refused to endorse him over his anti-immigrant rhetoric and proposal to build a wall along the U.S.-Mexico border. And he has drummed up conspiracy theories like the long-dismissed suspicion Democratic nominee Hillary Clinton and former President Bill Clinton were involved in the death of former White House aide Vince Foster.

Ryan has had to walk a fine line between trying to protect his GOP majority in the House and recognizing Trump's pull on the party , and has emphasized the need to "unite around our shared principles … to win this fall."