WASHINGTON—In 2017, when President Trump was fresh in his first term, then-Senate Majority Leader Mitch McConnell was asked by a student on a class trip what he thought of the new commander in chief.

President Donald Trump seems to have questioned a well-documented part of Sen. Mitch McConnell’s life — his childhood battle with polio

For the third time in three weeks, former Senate GOP leader Mitch McConnell (R-Ky.) had a scathing explanation after he voted "no" on a Trump nominee. Why it matters: Freed from his leadership role and with a long history of antagonism between himself and President Trump,

It’s the latest rhetorical assault from the president on the former GOP leader, who has voted against three of his nominations.

Mitch McConnell is pushing back against President Trump’s most controversial nominees, becoming an unlikely — and sometimes lonely — face of Republican resistance.

Sen. Mitch McConnell was a generational force for the Republican Party — using procedural tactics and political will to stymie much of former President Barack Obama’s agenda, hand President Donald Trump key first-term political victories and deliver a 6-3 conservative Supreme Court majority.

The GOP's recent and longest-serving Senate party leader has stood in opposition to his conference multiple times, demonstrating the party’s significant transformation in the age of Trump.