PHILADELPHIA (WPVI) — The race for one of Pennsylvania’s U.S. Senate seats remains too close to call a week after the election.

Incumbent Democrat Bob Casey and Republican challenger Dave McCormick are now separated by about 34,000 votes.

With 98 percent of the vote expected, McCormick leads by just over half a percentage point. Any Pennsylvania statewide race decided by half a percentage point or less is automatically subject to a recount.

McCormick declared victory after The Associated Press projected him as the winner last week. ABC News has not yet projected a winner.

But Casey campaign officials said Monday that the remaining votes to be counted could tilt the race in his favor.

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“Our county election officials will finish counting those votes, as they do in every election,” Casey said in a statement Tuesday. “The American democratic process was born in Pennsylvania and that process will continue.”

Any statewide recount must be ordered by the secretary of state by Nov. 14.

McCormick was invited to the Senate orientation

Senate Majority Leader Chuck Schumer invited McCormick to attend an orientation for new members today on Capitol Hill, Tuesday.

Republican senators protested earlier this week that McCormick was excluded from Schumer’s orientation week because there are still uncounted ballots in his race.

Schumer’s office said it is customary to wait until all the ballots are counted, but has since invited McCormick.

Deadline for Pinning Provisional Mail Ballots

Meanwhile, Tuesday is the deadline for voters with mail-in and provisional ballot issues to resolve them.

Election workers in Philadelphia flagged thousands of provisional ballots that require ID verification. Other counties have hundreds more.

And all those votes in limbo matter because of how close the Pennsylvania Senate race is.

RELATED: Deadline for mail-in, provisional ballots to be verified | Check the voting status

In order for your vote to be counted, you must present proof of identity to the electoral board. There are various options to call or even fax a form.

The Philadelphia Board of Elections is open today from 9:00 a.m. to 5:00 p.m