Former Presidents Bill Clinton and Jimmy Carter, along with dozens of senators, congressional leaders and other dignitaries have attended the event at the US Capitol.
The letter was detected during a routine inspection of mail and did not reach the US Capitol or Senator Wicker's office, a Senate leadership aide was quoted as saying.
Let me take you to the legislation that you and Congressman Jesse Jackson have put forth and that is to honor the late Rosa Parks with a statue at the US Capitol.
In a rare appearance at the US Capitol on Wednesday, Mrs Clinton spoke alongside Senate Foreign Relations Committee chairman John Kerry and Republican Senator Richard Lugar, also urging the Senate to ratify the treaty in response to a "continuing threat that is posed to our country".
BBC: Obama: Start nuclear treaty vital for national security
Earlier this week he spoke to us from his office on Capitol Hill.
When Mary Zurhorst Gray was a young girl living in 1920s Washington DC, she used to watch the great dome of the US Congress building, the Capitol, from her home two blocks away.
Joining us to discuss this and other Capitol topics is NPR's senior Washington editor, Ron Elving.
On the other side from Republican Kline is Democratic Congresswoman Susan Davis from California, and she joins us from her office at the Capitol.
NPR's David Welna has been following the debate on Capitol Hill, and he joins us now.
The White House will see a silver lining in today's grim GDP figures, if they help to remind the negotiators on Capitol Hill of the fragility of the US recovery.
As US federal debt approaches its statutory ceiling, confidence on Capitol Hill is growing that a deal to raise the limit will soon be struck, avoiding the theoretical possibility of default.
It's peace in our time on Capitol Hill, but the risk of a formal US default was always tiny.
Democratic leaders on Capitol Hill have a message for Detroit's major automakers: Show us a plan for restructuring and (maybe) we'll show you the money.
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