Kayleigh McEnany has made a mockery of her promise not to lie. Tuesday’s briefing was case in point.

President Donald Trump often tells reporters that big plans of his, such as health care or immigration proposals, will be unveiled in “two weeks.” It’s a tell — when Trump says something is coming in two weeks, you know it’s almost certainly not coming at all.

Trump’s favorite way of buying time has apparently rubbed off on Kayleigh McEnany, his fourth White House press secretary. Asked during Tuesday’s briefing if a health care plan that Trump has been saying is merely weeks away will finally be unveiled this week —...