Utah Sen. Mitt Romney Willard (Mitt) Mitt RomneyTrump 'no longer angry' at Romney because of Supreme Court stance GOP lawmakers distance themselves from Trump comments on transfer of power McConnell pushes back on Trump: 'There will be an orderly transition' MORE (R), who ran for president in 2012, defended his running mate Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE after President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE ripped Ryan as a "failed V.P. candidate" and also went after his record as House Speaker.

Romney, a frequent Trump critic, lauded Ryan on Friday as a "tireless campaigner, fundraiser, and conservative champion."

"As the sole person who could unite the House, he acquiesced to be Speaker as a service to the country," Romney tweeted of the Wisconsin Republican. "His selfless leadership and lifelong policy work were critical to the tax and regulatory reform that have helped propel the economy."

The fault for our 2012 loss is mine alone; @SpeakerRyan was a tireless campaigner, fundraiser, and conservative champion. As the sole person who could unite the House, he acquiesced to be Speaker as a service to the country. — Mitt Romney (@MittRomney) July 12, 2019

His selfless leadership and lifelong policy work were critical to the tax and regulatory reform that have helped propel the economy. A man like Paul Ryan does not often come along. — Mitt Romney (@MittRomney) July 12, 2019

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President Trump on Thursday blasted Ryan as having an "atrocious" record and tweeted that he "ultimately became a long running lame duck failure, leaving his Party in the lurch both as a fundraiser & leader."

"When Mitt chose Paul I told people that’s the end of that Presidential run," Trump added.

The president's tweets followed the release of excepts from an upcoming book by Politico's Tim Alberta. Ryan reportedly said in the book that he saw his retirement from Congress as an "escape hatch."

He also criticized the president in the book, which is set to be published on Tuesday.

“Those of us around him really helped to stop him from making bad decisions. All the time,” Ryan reportedly told Alberta. “We helped him make much better decisions, which were contrary to kind of what his knee-jerk reaction was. Now I think he’s making some of these knee-jerk reactions.”