3:20 p.m.

President Donald Trump is again attacking his predecessor on Twitter, asking why he didn't do more to prevent Russian election meddling.

Trump's tweet on Monday says: "Obama was President up to, and beyond, the 2016 Election. So why didn't he do something about Russian meddling?"

Trump raised similar questions over the weekend, after an indictment from special counsel Robert Mueller charged 13 Russians with a plot to interfere in the U.S. presidential election.

President Barack Obama in late 2016 defended his administration's response to the Russian meddling, also saying he had confronted Russian President Vladimir Putin that September, telling him to "cut it out."

Trump repeatedly challenged the veracity of the mounting evidence about Russian interference in the 2016 campaign. Over the weekend he denied ever casting doubts.

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12:20 p.m.

A man hired to drive a press van in President Donald Trump's Florida motorcade has been briefly detained by the Secret Service for bringing a firearm to the job.

The weapon was discovered Monday during a security screening outside Mar-a-Lago as agents checked bags belonging to press and staff. The outside contractor hired to drive a van of journalists in the White House press pool was then pulled aside. He and the other drivers were not allowed to drive the vans on to the club grounds.

The Secret Service said in a statement Monday that the man lawfully possessed a gun that was prohibited in its jurisdiction. It said the incident was investigated with the Palm Beach County Sheriff's Office and no one under Secret Service protection was in danger.

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9:55 a.m.

President Donald Trump is spending President's Day at his private golf club in West Palm Beach.

Trump has been in Florida for the weekend. He spent his time largely at his Mar-a-Lago estate as White House aides advised him against golfing too soon after a deadly school shooting in a nearby community.

The White House did not immediately answer questions about whether the president was playing golf Monday. The president also visited the golf club Sunday evening.

An avid golfer, Trump heads to one of his courses almost every weekend.

President Barack Obama took heavy criticism in 2014 when he went golfing during a vacation just minutes after denouncing the militants who had beheaded an American journalist. He later said he "should've anticipated the optics" of immediately going to play golf.

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9:40

The White House says President Donald Trump supports efforts to improve the federal gun background check system after a school shooting in Florida that left 17 dead.

Press Secretary Sarah Huckabee Sanders said Monday that the president had spoken to Sen. John Cornyn, a Texas Republican, about a bipartisan bill designed to strengthen the FBI database of prohibited gun buyers.

Sanders said, "While discussions are ongoing and revisions are being considered, the President is supportive of efforts to improve the Federal background check system."

The bill would penalize federal agencies that fail to provide the necessary records and reward states that comply with federal grant preferences and other incentives.

Trump has been a strong supporter of gun rights and the National Rifle Association.