Sen. Lindsey Graham (R-S.C.) on Tuesday warned naysayers of Stephen Miller that President Donald Trump’s loyalty to his prominent adviser is air-tight. (Watch the video below.)

Criticism of Miller within the Republican Party has increased as outrage festers over the dubious government shootings of two protesters demonstrating in Minneapolis against Trump’s deployment of federal officers to round up immigrants.

“As to Stephen Miller, to my colleagues who believe that you can convince Donald Trump that Stephen Miller is a liability for him, good luck with that,” Graham said on the “Hannity” Fox News show. “When this clock strikes 12 on the Trump era, there will be a few people walking out the door with Donald Trump. Stephen Miller will be in that group. So I want everybody to know on the Republican side that Stephen Miller is not the problem. Sanctuary cities is the problem.”

Some Republican lawmakers have recently called out Miller by name.

“This guy, after doing the stupid comments he made about Greenland, getting the president in a difficult circumstance, is one of the people that came out publicly and said that [second Minneapolis shooting victim Alex Pretti] was a terrorist before he had even talked with anybody on the ground, and that’s clearly not the case now,” Sen. Thom Tillis (R-NC) said this week. “...Stephen Miller never fails to live up to my expectations of incompetence.”

Florida state Rep Ileana Garcia, who worked for Trump’s Department of Homeland Security in his first term, called the administration’s response to the shooting of Pretti “abhorrent.”

She told The New York Times, “I do think that [Trump] will lose the midterms because of Stephen Miller.”