On Syria

When Mr. Christie got to the topic of Syria, he reminded the crowd that Mrs. Clinton had called President Bashar al-Assad a reformer and “a different kind of leader.” He said she bore some responsibility for the deaths of the 400,000 people who have been killed in Syria’s civil war: as he put it, “dead at the hands of the man that Hillary defended.”

“As an awful judge of the character of a dictator and butcher in the Middle East,” he said, “guilty or not guilty?”

Fact check: Mrs. Clinton’s comments about Mr. Assad came in an interview in 2011, before much of the bloodshed, when she said that some members of Congress in both parties “believe he’s a reformer.” Some in the George W. Bush administration had also expressed hope that he would be a better leader than his father, Hafez al-Assad. And Mrs. Clinton did not “defend” the atrocities committed by Mr. Assad during the later period of the civil war.

On Iran

Mr. Christie delivered a familiar critique of the signature agreement of the Obama administration, though it was reached a year ago last week, or two and a half years after Mrs. Clinton left the State Department. “She launched the negotiations that brought about the worst nuclear deal in history,” he said.

Fact check: Mrs. Clinton did indeed press the effort, sending two secret emissaries to feel out the Iranians about beginning talks. Mr. Christie’s assertion that “America and the world are measurably less safe” because of the deal is far more questionable: Iran gave up 98 percent of its nuclear fuel, dismantled vast numbers of centrifuges and other nuclear infrastructure, and so far appears to have stuck to everything it agreed to. (It is in the areas outside the agreement — missile launches and support for terrorism — that Iran is pushing the envelope.)

On Russia

Mr. Christie accused Mrs. Clinton of giving President Vladimir V. Putin “that stupid, symbolic reset button,” and said she had harmed the United States’ security and sought instead to strengthen Russia.

Fact check: Mrs. Clinton did support a “reset” of relations with Russia early in the Obama administration, pursuing a hope of Mr. Obama’s that the United States could pull Russia into a closer and more effective working relationship. That effort failed as Mr. Putin consolidated power.