Washington  — President Donald Trump’s fellow Republicans in the US Senate came under fresh pressure on Monday to allow witnesses in his impeachment trial, while his defence team took aim at Democrats’ accusations that he mounted a pressure campaign against Ukraine for his own political ends.

A New York Times report that former national security adviser John Bolton has written in an unpublished book manuscript that Trump told him he wanted to freeze security aid to Ukraine until Kiev helped with politically beneficial investigations prompted fresh calls by Democrats for Bolton and other witnesses to testify at the trial...

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