Senate panel plans subpoena vote for Google, Facebook, Twitter CEOs

• Lawmakers want to hold another hearing on the topic with industry executives as legislative proposals work their way through Congress.

Context: On Wednesday, the Department of Justice unveiled suggested language to amend the law with the backing of the White House and Republican attorneys general.

What's happening: On Oct. 1, the Senate Commerce Committee will vote to authorize subpoenas for Facebook's Mark Zuckerberg, Google's Sundar Pichai and Twitter's Jack Dorsey.

But, but, but: It's doubtful Democrats will be on board, which puts the outcome of the subpoena vote in flux, though Republicans run the Senate Commerce Committee. On Thursday, Sen. Maria Cantwell (D-Wash.), the committee's ranking Democrat, said in a statement that she would not "participate in an attempt to use the committee’s serious subpoena power for a partisan effort 40 days before an election."