Washington D.C. [USA], Jul 20 (NT): Following a major political controversy United States President Donald Trump has asked his national security advisor John Bolton to invite Russian president Vladimir Putin to Washington D.C. for a potential second summit.

White House Press Secretary Sarah Huckabee Sanders taking to her official Twitter handle, informed the negotiations to invite Putin to the US are already on track.

"In Helsinki, @POTUS agreed to ongoing working level dialogue between the two security council staffs. President Trump asked @Ambjohnbolton to invite President Putin to Washington in the fall and those discussions are already underway," Sanders tweeted.

Trump grabbed headlines for his comments on the alleged meddling of the 2016 US presidential election by Russia at joint press meet with Putin in Helsinki.

Trump had endorsed Putin's attitude on Russia's non-involvement in the 2016 US presidential election, claimed that he ran a clean campaign earlier on Monday.

Speaking in a joint press conference with his Russian counterpart at the Presidential Palace in Helsinki after the summit, Trump had asserted that there was "zero collusion" and that he ran a "clean campaign."

The US President had also referred that Special Counsel Robert Mueller's inquiry into Russian meddling in the 2016 campaign was "a disaster for our country.”  He also said that it had negatively impacted US-Russia ties. However, on Tuesday, President Trump claimed that he misspoke on the matter.