To say it the way the lawyers have, it is insulting. But may be correct that no real crime has been uncovered except among democrats who have a sick hatred of President Trump.
Trump's attorneys would like Mueller’s prosecutors to show that only the President can give them the information they require.
I believe this is a direct reference to illicit FISA surveillance against members of the Trump campaign. Trump's lawyers are giving a big hint here that they know exactly what Mueller got from that FISA surveillance.
They're effectively boxing Mueller in here.