John Cornyn and Ted Cruz will come together Thursday to boost the campaigns of several Republicans facing tough fights for re-election to the U.S. Senate.

The Texas senators are hosting a fundraiser at the home of Tandy and Lee Roy Mitchell in Dallas. The event will pump cash into the campaigns of Republican incumbents Kelly Ayotte of New Hampshire, Roy Blount of Missouri, Richard Burr of North Carolina, Rob Portman of Ohio and Pat Toomey of Pennsylvania.

All of the candidates, except for Toomey, will attend the luncheon event, as well as a dinner later that night in Houston.

The fundraiser is part of a busy week for Cruz in North Texas.

On Wednesday, he's helping volunteers make campaign calls at the Tarrant County Republican Party headquarters in Fort Worth. The former presidential contender will start making calls at 2:30 p.m.

I'll keep you posted on other events.

Republicans are trying to hold their majority in the Senate, and all of the candidates featured at Thursday's luncheon are in competitive races.

In some instances across the country, down-ballot GOP candidates are finding it difficult to navigate the tough political terrain created by Donald Trump, their presidential nominee.

At a debate last night in New Hampshire, Ayotte, who's facing a challenge from New Hampshire Gov. Maggie Hassan, drew criticism for describing Trump as a role model for children. She later retracted the statement, saying she didn't consider Trump or Hillary Clinton to be good role models.