President Donald Trump seemed to question a well-documented part of Sen. Mitch McConnell's life — his childhood battle with polio — after the Kentucky Republican opposed vaccine skeptic Robert F. Kennedy Jr.

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

A survivor of childhood polio, Sen. Mitch McConnell was the only Republican in the Senate to vote no. Here's how he explained his vote.