Rep. Devin Nunes (R-Calif.), a key ally of former President Donald Trump, will not run for re-election in 2022, a source with knowledge of his plans confirmed to The Post on Monday. The source added that Nunes — who was seen as the frontrunner to become chairman of the powerful House Ways and Means Committee if the GOP regained the majority after next year’s midterm elections — is expected to be named CEO of the former president’s new social media platform. Nunes, currently the ranking member on the House Intelligence Committee, was one of Trump’s most vocal defenders in Congress...