A Pennsylvania judge is expected to rule Tuesday whether or not to uphold a new state law requiring every voter to present a photo ID at the polls.

Supporters argue that the law signed in March by Republican Gov. Tom Corbett will prevent voter fraud and is upheld by the constitution. But opponents counter that the new law will disenfranchise voters, and any implementation should be postponed until after the November 6 presidential election.

The state Supreme Court has given Commonwealth Court Judge Robert Simpson, Jr., until Tuesday -- five weeks before the election -- to decide on the matter.

Here's a overview of what's at stake:

What exactly is the lower court judge ruling on?

Judge Simpson is not ruling on whether the law is constitutional -- that's up to the state supreme court. He has been tasked by the state's high court to determine whether people across the state have equal access to photo IDs in time for the November 6 election.

If he finds that they do not, the court is obligated to enter a preliminary injunction -- in other words, temporarily halt the law -- until after the upcoming presidential election to prevent voter disenfranchisement.

Whatever he decides, it's highly likely that the other side will once again appeal his ruling.

So, if the law is upheld, what will change for Pennsylvania's voters in November?

Prior to this law, first-time voters in Pennsylvania were allowed to present documents such as bank statements and utility bills in lieu of photo identification.