Factbox-Trump has slight edge over Biden in US swing-state election polls

FILE PHOTO: Republican presidential candidate and former U.S. President Donald Trump's campaign rally in Green Bay

By Moira Warburton

WASHINGTON (Reuters) -Seven U.S. states are likely to decide the outcome of the U.S. presidential election between Democratic President Joe Biden and Republican former President Donald Trump in November: Arizona, Georgia, Michigan, Nevada, North Carolina, Pennsylvania and Wisconsin.

These states - known as swing states because they swing between Democratic and Republican presidential candidates - play a critical role in determining which candidate wins the Electoral College, the vehicle that picks U.S. presidents.

Here is what opinion polls currently show for which candidate is leading in each state:

(Reporting by Moira Warburton in Washington; Editing by Scott Malone, Rosalba O'Brien and Jonathan Oatis)