Republican presidential candidate Chris Christie told Greta Van Susteren tonight that Barack Obama is one of the worst presidents in U.S. history.

Christie slammed Obama for raising taxes and refusing to work with Congress.

The New Jersey governor also noted reports that Russian jets are now shadowing U.S. drones over Syria, as Russia increases its military presence in the region.

"Just when you think it can't get worse, it does," Christie said. "Is there anyone home at the White House?"

Christie said it's a farce that Russia says it's in Syria to fight ISIS, stating that it's clear they're only there to prop up Syrian President Bashar al-Assad.

"His weakness and his timidity across the world has allowed people to take advantage of us," Christie said.

"This president has been one of the worst in American history."

Watch more above.

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