Talk show host Rush Limbaugh, a staunch supporter and "friend" of President Trump, will join the president Monday night at a rally for Republican Senate candidate Josh Hawley in Missouri.

Why it matters: This is Trump's final campaign rally for the midterm season. A new poll on Saturday showed Claire McCaskill, one of the most vulnerable Democratic incumbent senators, statistically tied with Hawley.

Update [Nov. 5]: An earlier version of this story said that Fox News host Sean Hannity would also be joining Trump at the rally, as noted in the Trump campaign's announcement. However, Hannity has since tweeted that he is not campaigning with the president, but "will be doing a live show from Cape Girardeau and interviewing President Trump before the rally."