Russia is determined to interfere in US elections despite sanctions and other efforts to deter such actions before the next presidential election in 2020, FBI Director Christopher Wray said on Tuesday.

“Everything we’ve done against Russia has not deterred them enough?” asked Senator Lindsey Graham, the Republican committee chairman. “All the sanctions, all the talk, they’re still at it?”

Mueller’s investigation disclosed an elaborate campaign of hacking and propaganda during the 2016 presidential race and resulted in indictments that charged 25 Russian individuals and three Russian companies.

The United States has imposed election-related sanctions on Russian oligarchs and military intelligence officials and there is a push for legislation threatening tougher sanctions in the US Congress.

The Russia investigation cast a shadow over Trump’s White House tenure and the president has repeatedly downplayed the Kremlin’s role in trying to help him win.At last year’s summit with Russian President Vladimir Putin in Helsinki, he sided with Moscow over US intelligence agencies.

In his most recent meeting with the Russian leader, in June, Trump appeared to make light of the issue, wagging his finger at the laughing Russian leader as he said, “Don’t meddle in the election, please.”

Senator Amy Klobuchar, who is seeking the 2020 Democratic presidential nomination, criticised Trump for joking about the issue.“Have you personally briefed the president about these threats,” she asked Wray.

“We have had a number of meetings with others in the National Security Council,” to discuss Russian efforts to interfere with the elections, he replied.

Wray includes efforts to interfere in US elections in a broader category of foreign influence campaigns in which foreign governments to affect US political sentiment or discourse.