You don’t bet the country on someones recent words that contradict their past words without actual deeds to back them up. To assume Trump has had an epiphany because he says so is extremely foolish.
He wants something. He’s very good at getting the things he wants. He’ll tell you as much. He has a long history of doing whatever it takes to get it. Including bragging about buying politicians to further his goals. One day so and so is the “greatest” and then when he’s got what he wants so and so is an “idiot”. There’s a pattern here that should not be ignored.
A better response would be "we welcome Mr. Trump to the pro-life view".