Regardless of his other Russia-related controversies, President Trump would make a catastrophic mistake were he to allow Vladimir Putin’s investigators to interrogate former U.S. Ambassador to Russia Michael McFaul.

Yet, that’s exactly what Trump seems to be considering in relation to a request from his Russian counterpart to interrogate McFaul, Putin critic Bill Browder, and a number of other innocent Americans. At their Monday meeting in Finland, Putin told Trump that if he granted Russian investigators access to the Americans, Putin would grant special counsel Robert Mueller access to Russian intelligence officers indicted for attacking the Democratic National Committee’s Internet server.