Longtime Georgia congressman Rep John Lewis said he does not believe Donald Trump is a legitimate president and he will not attend the upcoming inauguration.

With only one week before the President-elect takes the Oath of Office, his rise to power has been plagued with controversy amid allegations that Russia operatives helped influence the election in his favour.

Mr Lewis told Meet the Press that he believes the alleged actions of the Russian government during the election invalidate Mr Trump's incoming administration.

"I believe in forgiveness. I believe in trying to work with people. It's going to be hard. It's going to be very difficult," Mr Lewis said when asked about forging a relationship with Mr Trump's White House. "I don't see the President-elect as a legitimate president."

He added: "I think the Russians participated in helping this man get elected and they helped destroy the candidacy of Hillary Clinton. I don't plan to attend the inauguration. It will be the first one that I'll miss since I've been in Congress. You cannot be home with something that you feel is wrong."