What is the purpose of President Trump's executive order regarding independent agencies?

The executive order aims to further codify unchecked, unilateral executive power over independent agencies like the FCC, Federal Elections Commission, and FTC. It establishes that only the president or attorney general can speak for these agencies, despite their being designed by Congress to function independently. The White House is deliberately testing legal boundaries, believing that even if they lose some court challenges, they will ultimately succeed in enlarging the currently defined limits of executive power through these actions.