RANCHO MIRAGE, Calif.—Republican senators facing tight re-election battles remained loyal to President Trump during the Senate impeachment trial. Now, they are reaping the rewards.

Mr. Trump is set to hold campaign rallies this week with two of the most vulnerable GOP senators: Martha McSally of Arizona and Cory Gardner of Colorado. Both hail from states that will be competitive in the presidential election in November and hope Mr. Trump’s visit will help them rally voters and raise money.

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