Twitter has altered its policy on hacked content after its decision to block a news report critical of Democratic presidential candidate Joe Biden provoked Republican fury.
The social media behemoth -- used by hundreds of millions worldwide -- said late Thursday it would in future only block stolen information which was posted directly by hackers, and label any other information of questionable provenance.
Senate Republicans earlier said they would subpoena Twitter chief executive Jack Dorsey to testify before two different committees on why the company blocked links to an article in the New York Post alleging corruption by Biden in Ukraine.
Republican senator Ted Cruz called the decision "election interference," while Trump -- who trails Biden in polls 19 days before the presidential poll -- decried the blockage by both Twitter and Facebook.
The Post's story purported to expose corrupt dealings by Biden and his son Hunter Biden in Ukraine. The newspaper claimed that the former vice-president, who was in charge of US policy toward Ukraine, took actions to help his son, who in 2014-2017 sat on the board of Ukraine energy company Burisma.
But the outlet's source for the information raised questions. It cited records on a drive allegedly copied from a computer said to have been abandoned by Hunter Biden, that Trump lawyer Rudy Giuliani gave to the Post.
The Biden campaign rejected the assertions of corruption in the report.