Washington CNN  — 

Democratic Sen. Joe Manchin on Sunday defended his decision to vote against a sweeping voting rights bill and reiterated his opposition to gutting the filibuster, declaring in the strongest terms yet that he is not willing to change Senate rules to help his party push through much of President Joe Biden’s agenda.

“I believe that partisan voting legislation will destroy the already weakening binds of our democracy, and for that reason, I will vote against the For the People Act. Furthermore, I will not vote to weaken or eliminate the filibuster,” Manchin, a moderate Democrat from West Virginia, wrote in an op-ed published in the Charleston Gazette.

Manchin’s opposition to changing filibuster rules stands as a major roadblock to Biden’s legislative priorities, as current rules allow Republicans to hold up many of the progressive bills the administration supports, including infrastructure spending, federal voting legislation and climate change legislation.

The senator asserted that “the fundamental right to vote has itself become overtly politicized,” and – taking aim at members of his party – said some Democrats have “attempted to demonize the filibuster and conveniently ignore how it has been critical to protecting the rights of Democrats in the past.”

The moderate Democrat has in the past argued that Democrats who want to abolish the filibuster should be careful what they wish for, noting how then-Senate Majority Leader Harry Reid’s move in 2013 to remove the 60-vote filibuster standard for presidential nominees other than those on the Supreme Court – a change that eventually allowed Republicans to install a conservative majority on the high court.

Because he doesn’t support getting rid of the filibuster, Manchin urged Senate leadership to update and pass the John Lewis Voting Rights Advancement Act, a narrower elections bill that has the support of Republican Sen. Lisa Murkowski of Alaska. The proposal is a far less sweeping bill than S.1, but brings back major pieces of the 1965 Voting Rights Act, including a provision that requires states to consult with the federal government before making major changes to their voting rules.

“I am encouraged by the desire from both sides to transcend partisan politics and strengthen our democracy by protecting voting rights,” he wrote in the op-ed.

Manchin has remained a key holdup to the For the People Act for months, and he is the only Democratic senator not listed as a cosponsor on the bill.

Asked about his opposition to the measure on “Fox News Sunday,” the Democrat said he doesn’t support the legislation and referenced his op-ed. “I’ve been pretty clear on that,” he said.

“Voting is the bedrock of our democracy. Open, fair, secured voting. We used to go around the world and explain and show and observe voting procedures in a democracy. And now if we can’t practice what we preach, we are going to basically do an overhaul, an 800-page overhaul of the voting rights,” Manchin said.

Meanwhile, Sen. Angus King, an independent from Maine who caucuses with Democrats, said Sunday that while he’s generally opposed to getting rid of the filibuster, he would consider changing it in order to pass the For the People Act.

“If it comes down to voting rights and the rights of Americans to go to the polls and select their leaders versus the filibuster, I’ll choose democracy,” he told CNN’s Jake Tapper on “State of the Union.”

Senate Majority Leader Chuck Schumer said he plans to the bring the bill to the floor the week of June 21, but the legislation is expected to fall short of the 60 votes needed to pass as it currently has no Republican support.

CORRECTION: An earlier version of this story misstated Lisa Murkowski’s position in Congress. She is a senator.

CNN’s Sonnet Swire, Manu Raju and Stephen Collinson contributed to this report.