Joe Biden said he is putting Russia “on notice” about election meddling on Monday as Democrats in the House and Senate revealed that they had asked the FBI for a full congressional briefing on an alleged “foreign interference campaign” targeting Congress.

Biden, the former vice president and presumptive 2020 Democratic nominee, released a lengthy statement proclaiming that “foreign interference in the U.S. electoral process represents an assault on the American people and their constitutional right to vote.” This followed comments by the candidate on Friday when Biden said he had started getting intelligence briefings and asserted the Russians “are still engaged in trying to delegitimize our electoral process” and China “and others” are “engaged as well in activities that are designed for us to lose confidence in the outcome.”