I’m a legal Canadian in the US who was asked during the Obama admin if I wanted to register to vote when I went for a driver license renewal and was asked if I wanted to register to vote. I said ‘no, I’m not a citizen’. I was told ‘that doesn’t matter.’ . I respectfully declined. My wife is a citizen, my son is a citizen because he served in the US military. I’m not yet. I have and will continue to campaign for Trump but will not vote until I’m legally allowed to do so..
I would have reported that person who told you that.