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Sen. Mike Lee planned to launch his "All in This Together Tour" on Thursday in Draper, the beginning of a series of town halls to reach out to voters before Election Day.

Those events are now canceled.

Instead of campaigning in Utah, Lee will barnstorm for more vulnerable Republicans in places such as Nevada and Pennsylvania, a reaction to growing concern in the party that Republicans may lose control of the Senate, in part because of Donald Trump's slumping presidential campaign.

Marcus Jessop, Lee's political director, announced the cancellations on Facebook.

"As many of you are aware, this election cycle is unlike anything we have seen in past elections," Jessop wrote. "Senator Lee has been asked to help his Republican colleagues retain control of the U.S. Senate."

He identified six candidates Lee will help. They are Sens. Marco Rubio in Florida, Pat Toomey in Pennsylvania and Roy Blunt in Missouri, as well as Senate challengers Darryl Glenn in Colorado, Todd Young in Indiana and Joe Heck in Nevada.

Republicans now control 54 seats in the Senate, though they are likely to lose at least a few races in November. The election forecasters at FiveThirtyEight give Democrats a 55 percent chance of taking over the majority.

Lee is expected to easily win a second term in Utah. The most recent poll, conducted in August, had him leading Democrat Misty Snow by 35 percentage points.