Sen. Lindsey Graham (R-SC) ridiculed Donald Trump’s buzzed-about foreign policy speech on Wednesday, calling it disjointed, “pathetic,” and “not conservative.”

In a series of rapid-fire tweets in response to the speech, Graham poked fun at Trump for deviating from his usual off-the-cuff style and using a teleprompter.

“Trump speech is pathetic in terms of understanding the role America plays in the world, how to win War on Terror, and threats we face,” the South Carolina senator wrote on Twitter.

“Did teleprompter guy actually write the speech? #notmakinganysense,” Graham wrote.

“Final thought on Trump’s foreign policy speech — Ronald Reagan must be rolling over in his grave,” he added later.

Trump’s hour-long address at the Mayflower Hotel in Washington, D.C. set forth an “America first” foreign policy platform that cautioned against unnecessary foreign interventions. The GOP frontrunner also promised that Islamic State terrorists “are going to be gone” if he becomes president, thanks to his “unpredictable” foreign policy strategy.

Graham is an outspoken Trump critic, particularly on matters of national defense. The stridently hawkish South Carolina senator has called Trump “a complete idiot when it comes to Mideast policy.”

Read Graham’s tweets below:

Not sure who is advising Trump on foreign policy but I can understand why he’s not revealing their names. — Lindsey Graham (@LindseyGrahamSC) April 27, 2016

Question #1 for Trump: Are we sure the guy running the teleprompter has the pages in the right order? #notmakinganysense — Lindsey Graham (@LindseyGrahamSC) April 27, 2016

Question #2 — Did teleprompter guy actually write the speech? #notmakinganysense — Lindsey Graham (@LindseyGrahamSC) April 27, 2016

Trump speech is pathetic in terms of understanding the role America plays in the world, how to win War on Terror, and threats we face. — Lindsey Graham (@LindseyGrahamSC) April 27, 2016

Trump’s FP speech not conservative. It’s isolationism surrounded by disconnected thought, demonstrates lack of understanding threats we face — Lindsey Graham (@LindseyGrahamSC) April 27, 2016