I don’t remember Trump saying we should get rid of all income tax. When other politicians say we should get rid of all income tax, they usually combine it with raising the sales tax, which is a very bad idea because it hurts lower-income people much more than the wealthy. Let’s not confuse the issue here.
He did say it when he went to the Hill. It’s not a part of his platform and he said he would rather look at tariffs. He said he wasn’t putting pressure on anyone about it but it was an idea he had and was open to it.