GOP defends Trump as Bolton book adds pressure for witnesses

House Intelligence Committee Chairman Adam Schiff, D-Calif., joined by from left, Rep. Zoe Lofgren, D-Calif., Rep. Sylvia Garcia, D-Texas,, Rep. Hakeem Jeffries, D-N.Y., and Rep. Val Demings, D-Fla., speaks to reporters at the Capitol in Washington, Monday, Jan. 27, 2020, during the impeachment trial of President Donald Trump on charges of abuse of power and obstruction of Congress. (AP Photo/Manuel Balce Ceneta)

In this image from video, Ken Starr, an attorney for President Donald Trump, speaks during the impeachment trial against Trump in the Senate at the U.S. Capitol in Washington, Monday, Jan. 27, 2020. (Senate Television via AP)

In this image from video, Ken Starr, an attorney for President Donald Trump, speaks during the impeachment trial against Trump in the Senate at the U.S. Capitol in Washington, Monday, Jan. 27, 2020. (Senate Television via AP)

WASHINGTON — Pressure increased Monday on senators to call John Bolton to testify at President Donald Trump’s impeachment trial even as defense lawyers brushed past extraordinary new allegations from Trump’s former national security adviser and made legal and historical arguments for acquittal.