Trump campaigned via phone for three GOP candidates in Kentucky yesterday, urging voters to back candidates that include the challenger to Rep. Thomas Massie.

Trump split time during the event advocating for Rep. Andy Barr for Senate, Ralph Alvarado for the 6th Congressional district and Ed Gallrein for the 4th Congressional District where Massie is the representative.

“This is a group, great group of people, but that’s in Kentucky’s 4th Congressional District against a disastrous Thomas Massie. I say, he’s the worst Republican congressman in the history of the country,” Trump said.

“You need to send Ed Gallrein to fight for you in Washington,” Trump said during the call.

Gallrein called the primary a “pick a side moment,” arguing that a vote for Massie — who has previously said he votes with the GOP “90% of the time”  — would be “picking the radical Democrats” over “President Trump, the Republican Party and the Constitution.”

KENTUCKY (WKYT) – President Donald Trump’s endorsements of several Kentucky candidates have drawn attention to Tuesday’s U.S. Senate and House primary races, with political experts and party officials weighing in on the potential impact on voters.

Trump has been vocal on social media and in interviews about who should represent Kentucky in Washington.

“Something like an endorsement from President Trump or good coverage in partisan media can make the difference,” said Dr. Stephen Voss, a specialist in elections and voting behavior at the University of Kentucky.

Voss said presidential endorsements, especially from Trump, can easily sway a close election. He said the average voter is looking for a shortcut on who to push forward in the primary.

“Party identification drives how a lot of people vote, but in a party primary, that doesn’t help,” Voss said. “Voters in Kentucky that are republican are choosing republican politicians; voters need shortcuts so they can get their homework done, pick a candidate and move on. A Donald Trump endorsement for a lot of voters is the guideline they’d use to determine how to vote.”

Questions still remain surrounding Trump’s decisions to speak against certain candidates who have disagreed with him, including U.S. Representative Thomas Massie. The president endorsed Massie’s opponent, Ed Gallrein.

Kentucky Democratic Party Chair Colmon Elridge called it petty politics.

“Who we send to congress, who’s in the United States Senate — they affect people’s real lives and Donald Trump really is detached from the lives of the Emerican people and people right here in Kentucky,” Elridge said.

Adam Hope with the Republican Party of Kentucky said while the party cannot show favoritism, they support Trump’s decisions.

“Our president is definitely endorsing some candidates he feels like are gonna get the job done and advance his agenda in the best way he sees fit,” Hope said.

Hope said while these endorsements may not necessarily bring more people to the polls, they will get more people’s attention as to why primary races are important.