The White House has issued a warning to Democrats over their planned probes into the Trump administration, going as far as claiming that such investigations - a standard oversight function of Congress -- may amount to "blatant criminality." White House counsel Will Scharf issued the warning in a letter dated Monday to Rep. Robert Garcia, the top Democrat on the House Oversight Committee.

Garcia most likely would chair the powerful panel in the new Democratic-controlled Congress that is seated in January.

Garcia warned Trump officials to "lawyer up" after his party's stunning victories in last week's midterm elections.