Sen. Lindsey Graham (R-SC) questioned why President Joe Biden and Vice President Kamala Harris are not condemning the United Nations for inviting Iran’s president to speak at the U.N. General Assembly, claiming the Middle Eastern country is trying to “undermine” the United States’s election process.

Graham’s accusation comes about a week after the FBI revealed that Iranian hackers stole information from former President Donald Trump’s campaign and passed it to Biden’s team. Graham, who has been very critical of Iran, argued the lack of objection from Biden and Harris is “the weakest response” the White House could have given.