
Babygates, crates and leads are your friends here.
This has been so rewarding for your TT boy in the past he is NOT going to quit it now, they are not a breed known for giving up on a thing if it has EVER been rewarding in any way.
So - enforce the behaviour you do want - and set them up to succeed.
Visits are to be preceeded by LONG walks or training sessions or ideally, both, so that both dogs are knackered before they ever clap eyes on one another.
Split up the house so that you can use time outs to back up what you are saying. In case you don't know: time outs must not involve lots of chasing the dog around or tellings off or 'last chance and...' type stuff. Just evict the dog from the room, shut the door, count ten, allow him back in, repeat as necessary.
The first few times you WILL have to repeat it almost immediately, and ad nauseum because frankly, he would be a fool to just accept that something no longer works (you wouldn't.. if your pen stops writing you scribble harder, if the car won't start first time you turn the key a few more times.. etc), so he WILL try harder at first.
Dont be surprised if your TT is a canny little git and 'tests' behaviours on you. When we first used time outs on my boy, for being a pest towards our older dog (up in his face barking to get the toy he had), he thought after three time outs that it was teh NOISE he was making we didnt like... so persisted in the pestering and bullying IN SILENCE... he swiftly discovered that it was the entire behaviour, not JUST the yapping, that wasn't permitted, but the persistance and thought that went with it, 'ooh maybe if I bully him quietly...' was quite amazing.
If you have a situation where you cannot use time outs (because you are eating or otherwise cannot leap up and down evicting the dog every two seconds), use the crates/dogleads/baby gates to prevent the behaviour, and give them something better to do like stuffed kongs so that they are entertained and not just building up frustrations.