Will the US government have the potential ability to immediately seize any of Mt Gox/Coinlab/Customers cash and/or bitcoins after this transition?

I take it that currently the US would have no jurisdiction to seize assets from a Japanese company, in Japan, but if those assets are now held in the US, by a US company does that not open up that kind of situation?

If the US government were to seize assets from Coinlab in the US, would Mt Gox still cover all customers' balances/deposits (including US customers)?