/japan relations. >> reporter: hugh patrick is a founder of columbia business school's department and an expert on japan. >> what would be the worst-case scenario for japan economic. >> i -- that the u.s. becomes isolationist. it will make manufactured imports more expensive, by higher tariffs, by pursuing unilateral policies. in a more fundamental sense, it means american leadership in the world would no longer be as secure and good as it has been for the past 70 years. >> reporter: but a trump administration o offers an upsi for jajapan. patrick says that if trump does deliver on tax cuts and infrastructure, the japanese economy will benefit in the short term. >> well, clearly, if the u.s. engages these policies, which i think it will, the u.s. economy will grow more rapidly. it will benefit the whole world. and the economy, the global economy will grow somewhat better. and under those circumstances, japanese exports not only to the united states but other parts of the world will increase, and also probably foreign investment opportunity. >> reporter: however, for many in japan, the

hugh patrick is a recognized expert on japan. what would be the worst case scenario for japan? economically. >> the united states becomes isolationists. >> restrict all -- >> well doesn't end imports but makes manufactured imports more expensive by higher tariffs and pursuing unilateral policies. in a more fundamental sense, it means that american leadership in the world would no longer be as secure and good as it has been for the past 70 years. >> but a trump administration offers an up side for japan. patrick says that if trump does deliver on tax cuts and infrastructure, the japanese economy will benefit in the short term. >> clearly if the u.s. engages in these policies, which i think it will, the u.s. economy will grow more rapidly, it will benefit the whole world. the global economy will grow. and japanese exports but other parts of the world will increase and also probably foreign investment opportunity. >> however, for many in japan, the big question is what action will trump take on trade. >> i'm going to issue a notification of intent to withdraw from the transpacific