Rouhani indicated that Iran could toughen relations with the West as President-elect Ebrahim Raisi prepares to replace him next month.
The photo was confirmed as a fake in 2015. Gosar clarified he knew the picture wasn't real, but his "point remains to all but the dimmest."
"We have ZERO problems with the American people...Our sole problem is Trump. In the event of war, it is he who will bear full responsibility," a top Iranian presidential adviser said on Twitter.
Hassan Rouhani says the debates prove 'there is no morality' in the United States.
Rouhani is on his first European trip since economic sanctions were lifted against Iran.
While in Paris, he will sign a contract to purchase 114 Airbus planes to add to Iran Air's fleet.
The agreement has invigorated the Iranian president's foes rather than strengthen his position.
Nuclear deal in hand and boasting that Iran saved Baghdad from falling, Rouhani projects self-confidence.
Rouhani would be the first Iranian leader to visit France since 1999.
How long will it take for Supreme Leader Khamenei to undermine President Rouhani's democratic reforms?
The United States has indications that Iran has carried out air strikes on Islamic State targets in Iraq in recent days, U.S. officials said on Wednesday.
The conversion makes the nuclear material less suitable for building atomic bombs, a diplomatic source and a U.S. think-tank said on Monday.
U.S. Secretary of State John Kerry declined to make any predictions for what he called a "critical week" before a Nov. 24 deadline.