The US Senate has called for Sudan to allow humanitarian aid workers into restive Blue Nile and South Kordofan states where a quarter million people face food shortages, a US lawmaker said Friday.

The US Senate has approved legislation to strengthen ethics rules by forbidding lawmakers from buying stocks based on information they gather while performing their duties.

The US Senate on Wednesday passed a $109-billion highway bill that serves as a roadmap for boosting safety and improving infrastructure and freight transport on America#39;s roads.

The US Senate voted down Thursday a measure to start building the controversial Keystone XL oil pipeline between Canada and the Gulf Coast of Texas despite President Barack Obama#39;s opposition.

Frustrated by an quot;atmosphere of polarization,quot; Olympia Snowe of Maine announced she won#39;t seek a fourth term, thrusting a previously safe Republican seat into the heart of the battle over control of the US Senate.