FBI officials warned Donald Trump shortly after he became the Republican nominee last year that Russians might try to infiltrate his presidential campaign, NBC News reports, citing government officials. Both Trump and Democratic nominee Hillary Clinton were given a high-level counterintelligence briefing by top FBI officials, who told them foreign adversaries, including Russia, were likely to spy on and try to influence their campaigns, according to the report. They were both advised to notify the FBI about any suspicious proposals to their campaigns. Trump was reportedly “briefed and warned” about threats from Russia in particular. At the time of the briefing, the FBI was already aware of contacts between Trump’s campaign and Russia, and at least seven Trump campaign officials had communicated with Russians or figures linked to Russia—though these interactions were apparently not reported to the FBI.