In July, US Special Counsel Robert Mueller appeared before Congress to answer questions about his investigation of Russian interference in the 2016 US presidential election.

Skeptical Muller warned of Russian attempts to influence the election in favor of Donald Trump, but some were skeptical.

Republican Greg's to be asked if there was evidence of votes having changed because of Russian interference.

To be skeptical is to have or expressed doubt about the truth of an idea.

A sceptical person questions the reasoning of a belief or statement.