Sen. Lindsey Graham Lindsey Olin GrahamSteele Dossier sub-source was subject of FBI counterintelligence probe Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Key Democrat opposes GOP Section 230 subpoena for Facebook, Twitter, Google MORE (R-S.C.) joined President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE for a round of golf at his New Jersey club on Sunday, the White House said.

The president and Graham "discussed a number of issues including national security and trade" during their round, White House press secretary Sarah Huckabee Sanders said in a statement.

Trump is at his Bedminster golf club in New Jersey for a working vacation.

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Graham and Trump have often butted heads on foreign policy issues and occasionally on national security matters.

But like Trump, Graham has been particularly critical of China's trade practices and its alleged theft of American intellectual property. Trump has waged a trade war with Beijing for weeks.