At Mass on Sunday, Bishop of Lincoln Fabian Bruskewitz had a letter read to Catholics in the capital city.

In it, he called on them to stand against a mandate from Health and Human Services Secretary Kathleen Sebelius.

The mandate requires all insurance plans to cover contraception, but the use of birth control is considered immoral by the Catholic Church.

Bruskewitz says, "It's clear that their use is immoral, but whatever, that's not the problem. The problem is an attack on our freedom. They're requiring us, in what is supposedly a free country, to purchase a product that violates our conscience."

In a statement, Sebelius said, "Scientists have abundant evidence that birth control has significant health benefits for women and their families, it is documented to significantly reduce health costs, and is the most commonly taken drug in America by young and middle-aged women."

There is a conscience exemption clause in the mandate, but Bruskewitz says it is too narrowly written and doesn't include the church.

Other religions, like the Amish, have been granted waivers by the president.

Bishops around the country have joined Bruskewitz in his fight against the mandate in the hopes it's overturned.

He says it's likely they will pursue litigation.