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Biden was sworn in by the man he will be replacing, Vice President Dick Cheney.

WASHINGTON (CNN) – Just days after being sworn in for another term, Vice President-elect Joe Biden has sent the Senate a letter officially announcing his resignation.

"I am resigning my seat in the United States Senate as the senior senator from the state of Delaware to assume my duties as vice president of the United States," wrote Biden.

The resignation will be effective as of Thursday, January 15 at 5:00 pm ET.

Vice President-elect Joe Biden meets Pakistani officials in Islamabad, Pakistan, on Friday.

KABUL, Afghanistan (CNN) - Vice President-elect Joe Biden and Sen. Lindsey Graham arrived in Kabul on Saturday for meetings with U.S. military commanders and Afghan leaders, a U.S. military spokesman said.

Biden and Republican Sen. Lindsey Graham of South Carolina arrived in the Afghan capital after a one-day visit to Islamabad where they met with Pakistani President Asif Ali Zardari.

Pakistan's government is waging a bloody battle against Taliban and al Qaeda militants in its tribal regions along the border with Afghanistan.

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Obama will honor his former presidential rival at an inauguration week dinner.

WASHINGTON (CNN) - President-elect Obama will host a series of dinners the night before his inauguration honoring Ret. Gen. Colin Powell, Vice President-elect Joe Biden, and his former presidential rival, Republican Sen. John McCain, the Presidential Inaugural Committee announced Saturday.

"In these times of great challenge and great change, leadership requires rising above the same old narrow partisanship," the president-elect said in a statement released by the committee.

"Each of these distinguished Americans has spent his life in service to his country, at each and every moment placing the interests of America before issues of political party. That is precisely the spirit of common purpose we need as we begin the work ahead."

The committee said the events will be held at the National Building Museum, Union Station and the Hilton Washington.