"Senate GOP Leaders' Silence on Endorsing Trump Amid Mounting Pressure"

Senate Republican leaders, including Mitch McConnell, have not yet endorsed Donald Trump for the GOP nomination, despite about 60% of Republicans in Congress already endorsing him. Trump's victories in Iowa and New Hampshire are increasing pressure on remaining Republicans to publicly support him. McConnell's hesitance to endorse Trump reflects their contentious history, including McConnell's criticism of Trump's claims about the 2020 election and the Capitol riot. As Trump remains the dominant frontrunner in GOP polls, those who have not endorsed him face rising pressure to do so.