Interviewing Gabbard on the Late Show Colbert directly asked the candidate why she had been praised by Banon and Duke, a white nationalist.
"To those groups who are betting on the Americans, we say the Americans will not protect you," Syrian President Bashar al-Assad said.
Russian President Vladimir Putin, Turkish President Recep Tayyip Erdogan and Iranian President Hassan Rouhani met in the Black Sea city of Sochi, Russia, to discuss bringing the Syrian conflict to a close.
The Wilson Center's Aaron David Miller said the U.S. is "wandering around in the Middle East tied up by smaller and larger powers whose interests aren't our own, and tied up by our own illusions."
The president has lobbed attacks at the leaders of some of America's closest allies, as well as those of international rivals.
On Wednesday, U.S. District Judge James Selna agreed with prosecutors, and sentenced Syrian-American Rasheed Al Jijakli, 57, of Walnut, California for supplying Syrian rebels with "instruments of death."
"I know that the regime cannot be trusted," Jude Ash, a Syrian activist who is now an asylum applicant in the U.S., told Newsweek. "Any attempt by the regime to facilitate any transition or resolution, the main problem there is trust," he explained.
While the president criticized Russia and Iran during the Security Council meeting, he expressed appreciation for the "restraint" both nations have shown in Syria's Idlib province.
Bob Woodward's "Fear: Trump in the White House" will be released on September 11.
Russia's top diplomat warned the U.S. "not to play with fire" as Moscow rallied forces in support of the Syrian regime.
Iranian Defense Minister Amir Hatami said Syria and Iran had signed a new military cooperation deal as part of a reconstruction plan.
There have been hundreds of chemical attacks in Syria since 2011, but Bashar al-Assad continues to be protected by his Russian allies.
American journalist Austin Tice is still missing four years after the deaths of James Foley and Steven Sotloff.
Israel, Turkey and the U.S. have all targeted the Syrian President Bashar al-Assad's air force, but the longtime leader stands to regain the whole country.
Israel purportedly rejected a previous plan that would have seen Iranian forces kept about 60 miles from its border.
Syria and Israel have been technically at war since 1948 and have fought at least three major conflicts, including in 1967 when Israel seized the Golan Heights.
Report says Trump wants a deal with Russia to get the U.S. out of Syria "ASAP," but the Kremlin says it has "no idea" what CNN is talking about.
Opposition negotiator Nasr al-Hariri said such "U.S. silence" could only be due to a "malicious deal" made between foreign powers involved in Syria's war.
Putin praised the Russian military's success in Syria, saying the "army clearly demonstrated its growing potential and better coordination among military units in the struggle with terrorists."
The U.S.-led coalition is tasked with battling ISIS, but it has occasionally clashed with pro-Syrian government forces also battling the jihadis.
The U.S.-led coalition battling ISIS has denied responsibility for the strikes.
Assad also said that Russia does not dictate his government's actions.