Local and national GOP leaders distanced themselves Wednesday from a Florida congressional candidate who sent a fundraising letter stating that “anti-American radical Democrats” should be hung for treason.

George Buck, one of six Republican primary candidates for Florida’s 13th Congressional District, referred to several Democrats but in particular to Congresswoman Ilhan Omar, D-Minnesota. Omar was born in Somalia and came to the U.S. as a child.

In the recent letter to potential donors, he said that “we should hang” Omar and other “traitors” for “abusing our system to destroy our country.” He mentioned “tinfoil hat accusations” against President Donald Trump, but didn’t elaborate.

Buck’s letter cited an unverified story that Omar is an asset of a foreign government who passed information to another foreign government. Omar has denied the report, calling it ”outlandishly absurd” in a statement.