CONSTITUTION. OUR JUSTICE CORRESPONDENT PETE WILLIAMS HAS THOSE DETAILS. >>Reporter: ADDING NEW LEGAL FIREPOWER TO CHALLENGE PRESIDENT TRUMP’S WORLDWIDE BUSINESS HOLDINGS, MARYLAND AND THE DISTRICT OF COLOMBIA SAY HE’S VIOLATING THE CONSTITUTION’S BAN ON PUBLIC OFFICIALS RECEIVING PRESENTS OR PAYMENTS FROM FOREIGN SOURCES. THOSE PROVISIONS ARE WALLS THEIR SUIT SAYS AGAINST PRESIDENTIAL CORRUPTION. >>ONE THING WE KNOW ABOUT PRESIDENT TRUMP IS HE UNDERSTANDS THE VALUE OF — WALLS. THIS IS ONE HE CAN’T CLIMB UNDER. >>Reporter: THE LAWSUIT SAYS MR. TRUMP MARKETS HIS PROPERTY AS PRESIDENT AND BENEFITS BY PAYMENTS FROM FOREIGN COUNTRIES AND HOLDING VENTS AND STAYING AT HIS WASHINGTON HOTEL. TOO MUCH OF A CONFLICT THEY SAY WHEN…