Congress can subpoena anybody. And Newt is only talking about arresting a judge that failed to heed a Congressional summons.
Rediscovering the power to impeach judges would reign in a lot of the craziness we have seen out of the judicial branch.
I'm not sure Congress actually has the authority to arrest people who refuse a summons. On the other hand, it should certainly have the authority to subpoena a judge or executive employee with a notice that failure to appear will be regarded as a resignation. If an official opts to resign, Congress would cease to have authority over that person.