Will Democrats issue a subpoena to force Barr to testify on Mueller's report?

U.S. Attorney General William Barr's refused to testify at a House of Representatives hearing on Thursday that  sets to escalate tensions with Democrats probing his role in the release of Special Counsel Robert Mueller's report into Russian interference in the 2016 U.S. election.
Committee Democrats vowed to issue a subpoena to force Barr to testify, while the Democratic-led House Judiciary Committee Chairman Jerrold Nadler  held out hope that the attorney general would reconsider and show up when the hearing convenes at 9 a.m. (1300 GMT) on Thursday.
At a Senate hearing on Wednesday, Barr defended his handling of the Mueller report on Russia’s interference in President Donald Trump’s favour in the 2016 U.S. election and whether Trump subsequently tried to obstruct Mueller’s probe.
Barr's decision surfaced hours after the committee adopted a more aggressive format that would subject the attorney general to an extra hour of questions from committee lawyers, in addition to questions from Democratic and Republican lawmakers on the panel.
Source: Reuters