This morning, Twitter CEO Jack Dorsey and Facebook COO Sheryl Sandberg appeared before the U.S. Senate Intelligence Committee to discuss foreign interference, specifically from Russian Federation, in U.S. elections via social media. US intelligence agencies have concluded that Russian Federation interfered in the 2016 campaign with the aim of tilting the election in Trump's favor, a finding that Moscow has denied.
"Over the last 18 months we've met with dozens of Committee Members and briefed major Congressional Committees numerous times on our work to prevent foreign interference in U.S. elections", a Google spokesperson said in an email.
"The actions we've taken in response. show our determination to do everything we can to stop this kind of interference from happening", Sandberg said.
In August, Twitter came under fire from its users and even from some employees for not joining numerous top social media platforms in banning Alex Jones.
Top Twitter and Facebook executives will defend their companies before U.S. lawmakers on Wednesday, with Facebook insisting it takes election interference seriously and Twitter denying its operations are influenced by politics.
The company's No. 2 executive says in prepared testimony ahead of a Senate intelligence committee hearing Wednesday that those adversaries include financially motivated troll farms and "sophisticated military intelligence operations".
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Trump is stepping up pressure on the Canadians to join a preliminary deal that he reached with Mexico earlier this week . In July, the commerce secretary, Wilbur Ross, said he considered talk of withdrawing from the WTO "a little premature".
Moscow denies involvement, and Trump - backed by some of his fellow Republicans in Congress - has repeatedly dismissed investigations of the issue as a partisan witch hunt or hoax.
Dorsey will follow the Senate hearing with another hearing that could be politically more contentious - an appearance before the House Energy and Commerce Committee that will specifically address Twitter's "algorithms and content moderation".
While there will likely be some technical discussions during the testimony, Dorsey may face some tough questions from the House. Some Republicans, including President Donald Trump, have pushed the idea that Twitter is "shadow banning" some in the GOP because of the ways search results have appeared.
Google said Walker would be in Washington on Wednesday and be available to meet with lawmakers. "It's not fair to large portions of the population", Trump said at a press conference last week.
A committee spokesperson said Walker's "commentary" was not testimony, adding, "We wish his enthusiasm for participating in the company's public hearing extended to his company's senior leadership, and that they were willing to answer the committee's questions".