Congress has passed legislation to prevent the diplomat from entering the country.
They want to end the Pentagon's business with Rosoboronexport.
Ambassador Samantha Power says texting kills more U.S. teen drivers than drinking.
Obama emphasized to Merkel the need for sanctions, should the situation escalate.
Three people were killed and hundreds wounded in the April 2013 bombing.
France is going ahead with the sale of two warships, despite the crisis in Ukraine.
Sen. Kelly Ayotte (R-N.H.) said Thursday that she is writing a bill that would impose tough new financial sanctions on Russia and provide aid for Ukrainian forces.
The Senate Intelligence Committee has already voted to release the report.
The United States’ image around the world has rebounded over the last year, according to a Gallup survey released Thursday.
The legislation now heads to President Obama, who is facing a difficult veto decision.