President Trump on Tuesday floated the possibility of eliminating the federal capital gains tax on home sales, in a move that would change the way real estate profits are taxed for the first time in 30 years. Speaking to reporters in the Oval Office on Tuesday, Mr. Trump suggested he is weighing supporting legislation introduced by Rep. Marjorie Taylor Greene of Georgia that would nix the existing capital gains tax on home sales. Greene called the tax "an outdated, unfair burden—especially in today's housing market, where values have skyrocketed."  "We're thinking about that," Mr. Trump responded to a reporter, when asked how important it is that the capital gains tax be eliminated in order to "unleash" the housing market. "It would also unleash it just by lowering the interest rates," the president said, adding, "If the fed would lower the rates we wouldn't even have to do that. But we are thinking about no tax on capital gains on houses."  Currently, single-tax filers can exclude…