Evan Feinberg, an outgoing staffer for Sen. Rand Paul (R-Ky.), will challenge Rep. Tim Murphy (R-Pa.) in a primary.

Feinberg confirmed in a phone interview that he “plans on filing the paperwork this week.”

“I’m definitely thinking about running for Congress,” Feinberg said. “I’m taking the necessary steps to mount a primary challenge against Rep. Tim Murphy.”

Feinberg faces an uphill battle against Murphy, a five-term Republican from southwestern Pennsylvania with $720,000 in the bank.

In 2010, Murphy had no primary opposition and won re-election with 67 percent of the vote.