President Donald Trump's critics warn that even on his way out of the White House he is sowing the seeds for extremist right-wing violence.
Merkel noted that people still have an obligation to "oppose all tendencies that seek to destroy democracy. This includes right-wing extremism."
"As we saw in Charlottesville, this mission is more important than ever," George Selim said.
Police say the self-described nationalist planned to shoot the French president on Bastille Day, when Donald Trump will be Emmanuel Macron's special guest.
The Trump administration continues to focus on combating Islamist extremists, overlooking the bigger problem of right-wing terrorism.
The Anti-Defamation League's new report, "A Dark and Constant Rage," chronicles 25 years of right-wing terrorism in the U.S.
Since 2002, right-wing militants have killed more people in the United States than jihadis have.
Stieg Larsson's partner talks about the couple's efforts to combat right-wing extremism in Europe.