President Donald Trump's fellow Republicans in the U.S. Senate came under renewed pressure on Monday to allow witnesses in his

President Donald Trump's fellow Republicans in the U.S. Senate came under renewed pressure on Monday to allow witnesses in his impeachment trial, while his defense team ignored new disclosures from a former top White House adviser.

Kenneth Starr, the lawyer whose investigation led to the impeachment of former U.S. President Bill Clinton in 1998, told the Senate on Monday that the process was happening all too often in what he called an "age of impeachment" as he spoke in defense of his client, President Donald Trump.

U.S. President Donald Trump's Senate impeachment trial was overshadowed on Monday by an unpublished manuscript from former national security adviser John Bolton that said Trump wanted to freeze U.S. aid to Ukraine to pressure the country for politically beneficial investigations.

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

President Donald Trump's impeachment trial may not result in his removal from office, but it could help determine whether his Republicans retain control of the Senate in the November congressional elections.

President Donald Trump's fellow Republicans in the U.S. Senate came under fresh pressure on Monday to allow witnesses and new documents in his impeachment trial, while Trump's defense team argued that policy differences were a crucial reason that Democrats have sought to remove him from office.

Moderate U.S. Republican Senator Lisa Murkowski said on Monday she is curious about what former White House national security adviser John Bolton has to say, following reports of his manuscript, and it is nearly time to consider whether senators weighing evidence in the impeachment trial need additional information.

President Donald Trump's fellow Republicans in the U.S. Senate came under fresh pressure on Monday to allow witnesses and new documents in his impeachment trial after a news report that a former top aide, John Bolton, has written a book manuscript that undercuts Trump's versions of events in the Ukraine affair.

Republican U.S. Senator Susan Collins said on Monday the case for calling witnesses in President Donald Trump's Senate impeachment trial had been strengthened by a New York Times report on a book manuscript by former Trump adviser John Bolton.