Pennsylvania's top election official certified Democrat Joe Biden's victory in the key battleground state, dealing another significant blow to President Donald Trump's efforts to overturn the election results.

Secretary of the Commonwealth Kathy Boockvar certified Biden's 80,555-vote victory in Pennsylvania, which was announced in tweet by Democratic Governor Tom Wolf.

The certification is the official declaration that Biden won Pennsylvania and its 20 Electoral College votes. Wolf said he's signed the certificates of ascertainment for the electors who will cast their votes for Biden when they meet on Dec. 14, unless a court intervenes.

"Today's certification is a testament to the incredible efforts of our local and state election officials, who worked tirelessly to ensure Pennsylvania had a free, fair and accurate process that reflects the will of the voters," Wolf said in a statement.

Trump, who has repeatedly claimed, to have won the Nov. 3 election has filed lawsuits and demanded recounts and audits across several battleground states.

Among the remaining contested battleground states, Georgia certified its election results last week and Michigan on Monday. Nevada will certify on Tuesday, Arizona on Nov. 30 and Wisconsin by Dec. 1 after a recount in two counties requested by Trump.

(With input from agencies)