A lot of the executive orders he did that don't require congressional approval, like placement of tariffs on China, could be undone with the stroke of a pen.
Maybe. The Clinton Foundation is running out of cash, so if pen's to cheque, anything is possible. Problem is Democrats aren't necessarily any better than Republicans. So all the anti-Russia hysteria, sanctions and tariffs. Same may be applied to China, eg Huawei etc, especially if it's to 'protect ordinary Americans', which roughly translated means lobbyists. They're frequently partisan and will lobby for their own industries, regardless of who's propping up the Resolute desk.