Washington: US President Donald Trump says Special Counsel Robert Mueller should not testify in congress about the investigation into Russian interference in the 2016 presidential election.

US President Donald Trump. Credit:AP

Trump said on Twitter on Sunday that Democrats in congress were seeking a "redo" of Mueller's report, which declined to conclude whether the president's efforts to impede the investigation constituted obstruction of justice.

The president's comments came as a key lawmaker said Mueller, whose report on Russian meddling in the 2016 presidential election has enthralled the nation, was expected to testify before congress on May 15.

David Cicilline, a member of the House Judiciary Committee, said a 'tentative date has been set of May 15 and we hope the special counsel will appear".