Rep. Jerrold Nadler on Sunday threatened to issue a subpoena to compel Attorney General William Barr to appear before his House panel after Barr reportedly balked over how he would be questioned. “Then we will have to subpoena him and we will have to use whatever means we can to enforce the subpoena. We’ll use all legal mechanisms to get them to comply with the subpoenas and they will comply,” the New York Democrat told reporters during an appearance on Staten Island. “Ultimately, the law says they have to comply. What the administration is doing is seeking to draw it...