President Trump says he wants to make a deal for minerals from Ukraine in exchange for aid. That followed a long effort by Ukrainian officials to appeal to Mr. Trump’s transactional nature.

Senators Lindsey Graham and Tom Cotton said that the former Trump aides faced continuing threats from Iran and that the decision could affect how current officials do their jobs.

The South Carolina Republican told CNN that he “did not like” how Trump pardoned people who “beat up cops,” and suggested he would be open to curtailing the presidential pardon power.