The relationship wouldn't be as simple as decided upon a 1:1 or 1:51 vote, as the EU democratic structure allows for veto to facilitate consensus decision making, and as US would have it's own unilateral trade agreements and opposed to a single common trade agreement, things would get particularly messy for Trump, as he would have to drop 'America First', and even if agreement was reached on trade standards, it is unlikley that Trump would allow UK any say on social policy, environment policy etc which are enshrined in EU treaties.