Members of President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE's Cabinet are reportedly expected to meet Tuesday at the White House to discuss issues related to border security and funding for Trump's proposed wall along the U.S.-Mexico border.

Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE and Homeland Security Secretary Kirstjen Nielsen Kirstjen Michele NielsenDHS IG won't investigate after watchdog said Wolf, Cuccinelli appointments violated law Appeals court sides with Trump over drawdown of immigrant protections Democrats smell blood with new DHS whistleblower complaint MORE are set to attend the meeting, administration officials told CNN.

The meeting is expected to cover a range of issues related to defense and Trump's proposal to use funds that Congress appropriated for the Pentagon to construct a border wall.

Trump has reportedly floated the idea to aides and Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.), calling it a national security issue. He suggested in a meeting last week that the Pentagon's massive budget could cover the costs of a southern border wall.

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The $1.3 trillion omnibus spending bill passed by Congress last month allocated $1.6 billion for border security and included restrictions on how the money can be spent, paving the way for it to go toward fencing and levees.

The funding was far short of the $25 billion demanded by Trump for construction of his proposed border wall. The president has previously declared that Mexico would foot the bill for the wall.

The Pentagon has indicated that a reallocation of defense funds for the wall would likely require congressional approval, while Senate Democrats have suggested the move could be illegal.

The administration officials are reportedly also set to discuss the "caravans" of migrants panned by Trump in several tweets this week – a group of nearly 1,100 people traveling through Mexico to find political asylum in the United States.

The meeting did not appear on the White House schedule for Tuesday.