Former Sen. Rick Santorum (R-Pa.) on Sunday said President Trump's tweets may make it difficult for the administration to pursue its agenda.

During an interview on CNN's "State of the Union," Santorum said this administration could be doing "so well" if they focus on "getting their agenda passed."

"The last nine days have hopefully shown the president that if you stay on message, you stick to the script, you focus on policy, you drive home the messages that you talked about during the campaign and that people in America are excited about, you can be a great president," he said, referring to Trump's recent nine-day overseas trip.

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"If you tweet every day and complain about the media and complain about how you are being treated, you're going to be sidetracked and you're not going to get your deals done. That's the message," Santorum warned.

Trump just returned from his first foreign trip, which included stops in Saudi Arabia, Israel and Italy. He returned to a series of controversies facing his administration after a steady flow of leaks.

The president took to Twitter early Sunday morning to tout the success of his trip and decry White House leaks.

In a series of tweets, he said he believes many of the recent leaks coming out of his White House are made up by the "fake news" media.

"It is my opinion that many of the leaks coming out of the White House are fabricated lies made up by the #FakeNews media," the president tweeted Sunday.

"Whenever you see the words 'sources say' in the fake news media, and they don't mention names...it is very possible that those sources don't exsist but are made up by fake news writers. #FakeNews is the enemy!" he tweeted.