The issue focused on concerns over criminal sanctions against Russia for Ukraine's illegal annexation of Crimea and alleged involvement in Russian operations in eastern Ukraine. The legislation could prohibit financial transactions between Ukrainian authorities and Russians based on economic links to Moscow.

White House spokesman Jay Carney told reporters Friday that President Barack Obama would review all legislation passed by Congress before deciding whether to veto it. He did not explain why he believed legislation targeting Russia was unconstitutional.

Sen. Rand Paul (R-Ky.), who serves as chairman of the