Key Senate conservatives could derail President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE’s choice to fill a spot on the Federal Reserve Board, threatening to derail the nomination that has a small margin for GOP opposition.

Sen. Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE (R-Ky.) told reporters Thursday that he would vote against Marvin Goodfriend’s nomination to be a Fed governor, according to multiple reports, citing the economist’s unconventional monetary policy proposals.

And a spokesman for Sen. Mike Lee Michael (Mike) Shumway LeeMcConnell shores up GOP support for coronavirus package McConnell tries to unify GOP Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump MORE (R-Utah) told The Hill that the conservative senator was "undecided" on Goodfriend's nomination.

Paul’s opposition means Goodfriend must receive unanimous support from the 50 other Senate Republicans to be confirmed, including Sen. John McCain John Sidney McCainMcSally says current Senate should vote on Trump nominee Say what you will about the presidential candidates, as long as it isn't 'They're too old' The electoral reality that the media ignores MORE, who has missed Senate votes while he recovers from treatment for brain cancer at home in Arizona.

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No Democrats are expected to vote for Goodfriend, meaning that should Goodfriend receive 50 votes, Vice President Pence would have to break the tie to confirm the nominee.

Goodfriend, a Carnegie Mellon professor and former Richmond Fed senior vice president, has drawn criticism for incorrect predictions about rampant inflation during the early 2010s and proposals meant to reduce the value of cash withdrawn from banks in times of crisis.

Goodfriend had proposed placing magnetic strips on currency that would track the length of time a note had been deposited at a bank. The idea is meant to encourage banks to lend money to stimulate the economy when Fed interest rates are already at zero.

The proposal would effectively create negative interest rates, reducing the value of money kept in bank accounts.

Goodfriend has since abandoned the magnetic strip proposal but has expressed a willingness to explore other negative interest rate policies. Former Rep. Ron Paul (R-Texas), Rand Paul's father, introduced a bill in 1999 and 2003 to ban such policies, both of which died without committee or floor action.

The Senate Banking Committee voted to advance his nomination Thursday morning 13 to 12 along party lines.

Updated at 3:03 p.m.