Colorado Republican U.S. Rep. Mike Coffman is calling for the resignation of the U.S. Veterans Affairs secretary as he faces allegations of abusing government travel privileges.A report this week from the Veterans Affairs inspector general also says David J. Shulkin's staff made false statements and altered an email for a cover-up."The abuses detailed in the VA's inspector general report violate the trust and integrity that our veterans and taxpayers demand and deserve," Coffman, R-Aurora, said in a statement.