I thought this was true. However, President Trump may not be in possession of this memo. Thus, it may require a vote of the House to physically release it to him.
I'm just guessing, here. Otherwise, I cannot imagine why President Trump would have not already released it. One of the congressional sponsors of "release the memo" was on talk radio this morning. If it had been simple, I believe he would have suggested a short cut.
Actually, the radio host suggested giving the memo to Feinstein and then making sure she had the flu. :) Apparently, that is the recipe for the unlawful release of information held by Congress.