The Liberty Party, whose candidate Charles Brumskine was considered a front-runner to take over from Nobel Peace Prize victor Ellen Johnson Sirleaf, said it would consider taking legal action if the National Elections Commission (NEC) did not act on its demands.
The final results are due to be declared today by Liberia's National Elections Commission (NEC).
"As a longstanding friend, the United States applauds the people of Liberia for exercising their democratic right to vote in the historic presidential and legislative elections", said a statement from US State Department spokesperson Heather Nauert.
Arsenal manager, Arsene Wenger has congratulated his former player George Weah, on his election as the new President of Liberia. In 2005 George Wea again ran for president, but then remained second in the vote, after Surley.
Worldwide observers said Tuesday's vote went smoothly despite late starts in some counties.
The United States called the election "an important step toward achieving Liberia's first peaceful transfer of power from one democratically elected head of state to another in decades".
Voters commended her leadership but said they were ready for change.
The AU and ECOWAS made several recommendations about the electoral process including the need for a review of the electoral register which accounted for long winding queues on voting day, as well as adequate training for election staff.
The election marks the end of Ellen Johnson Sirleaf's tenure.