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Press secretary Sarah Huckabee Sanders is scheduled to brief reporters at the White House on Tuesday.

The first briefing of the week follows President Donald Trump's second White House meeting with Crown Prince Mohammed bin Salman of Saudi Arabia. Crown Prince Mohammed arrived in the U.S. on Monday in pursuit of investment opportunities and strengthened diplomatic ties.

The 32-year-old prince has found common ground with Trump over the two leaders' mutual opposition to the 2015 Iran deal, brokered under President Barack Obama. The deal loosened sanctions on Iran in exchange for limits on the country's nuclear program and the ability to conduct international inspections.

Trump meets the Saudi prince as special counsel Robert Mueller's investigation of potential coordination between the Trump campaign and Russia has recently drawn the president's ire. A shakeup of the White House legal team could be coming, multiple outlets reported.

In a first, Trump on Sunday criticized Mueller by name in a tweet.

Trump tweet Why does the Mueller team have 13 hardened Democrats, some big Crooked Hillary supporters, and Zero Republicans? Another Dem recently added...does anyone think this is fair? And yet, there is NO COLLUSION!

The New York Times and the Washington Post reported that White House lawyers, including John Dowd and Ty Cobb, could be leaving Trump's legal team. White House officials disputed the report.

The president's salvo of tweets over the weekend prompted responses from some congressional Republicans, who defended Mueller's right to continue the probe against the possible threat of being fired by Trump.

Meanwhile, representatives of social media giant Facebook are set to testify before congressional committees Tuesday and Wednesday, over the handling of users' personal data by Trump campaign-affiliated research firm Cambridge Analytica during the 2016 election.

And markets braced for U.S. Federal Reserve Chairman Jerome Powell's first meeting as head of the central bank, in which he was expected to provide new signals about potential interest rate hikes. Stocks fell more than 1 percent on Monday, but made up some of their losses by midday Tuesday.