Sen. Ted CruzRafael (Ted) Edward CruzThe Memo: Trump leaves chaos in his wake in UK Beto O'Rourke is dominating Ted Cruz in enthusiasm and fundraising — but he's still headed for defeat GOP senators introduce resolution endorsing ICE MORE (R-Texas) jabbed President Obama on background checks and Syria on Wednesday night.

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"President Obama announced that the United States is going to give weapons to the rebels in Syria," Cruz said during a panel at the Young Americans for Liberty's Annual National Convention. "I'll confess, my first reaction — we tweeted the simple question 'I wonder if President Obama is going to insist on a background check before he gives the rebels their weapons?' "

Cruz's jab is an allusion to President Obama's push earlier in the year to pass new laws expanding background checks on gun purchasers. But that effort failed to move beyond the Senate.

On Syria, Obama has received criticism from Tea Party Republicans and liberal Democrats in response to his decision to provide military support to Syrian rebels. In late June, House lawmakers introduced a trio of bills that aimed to limit funding the rebels.

Cruz was joined by Sens. Mike LeeMichael (Mike) Shumway LeeGOP moderates hint at smooth confirmation ahead for Kavanaugh GOP senators introduce resolution endorsing ICE GOP senator moves to restart Pentagon report on NATO allies' spending MORE (R-Utah) and Rand PaulRandal (Rand) Howard PaulRand Paul ‘concerned’ about Kavanaugh Rand Paul on Russia indictments: We should focus on protecting elections instead of 'witch hunt on the president' Sunday shows preview: Trump readies for meeting with Putin MORE (R-Ky.) at the event. The discussion touched on a range of issues, including what Senate Republicans would do if they retook their chamber in 2014. Paul said he was optimistic Republicans could pass legislation that would require an audit of the Federal Reserve if they gained control of the Senate.

"I think we have a really good chance, if we take over, of getting an audit the fed bill through," Paul said.