paul solman.ff: we are joined tonight by mary lovely, a senior fellow at the peterson institute for international economics. thanks for coming. we have this paws on tariffs for canada and mexico. how much of this is actually about addressing a trade imbalance? i raised the question because donald trump negotiated a trade deal with canada and mexico. is there an actual problem these tariff seem to solve? mary: the president has identified two problems of the border. sony has on occasion talked about the trade deficit that we have but it's hard to know what weight he places on these factors. for today's announcement, it looks like it was on the border. >> when he talks about canada, he complains about the trade imbalance, which has existed for decades. canada sells more goods and services to the u.s. than advise from us. does that justify tariffs? >> there's no reason we should have balance bilaterally. there's no reason that the grocery store should buy as much for me as i buy from it. there is no