WASHINGTON — President Trump, who has spent months assailing the Federal Reserve for its interest rate policies, said he planned to nominate Christopher Waller, a longtime regional Fed official, and Judy Shelton, a Fed critic, to serve on the central bank’s seven-member board.

The president announced his intentions on Tuesday evening in a series of tweets. Mr. Waller, the executive vice president at the Federal Reserve Bank of St. Louis, is a far more conventional pick than Mr. Trump’s earlier Fed choices of Herman Cain and Stephen Moore.

Mr. Cain, a former presidential candidate, and Mr. Moore, a conservative economist, were outspoken pundits with strong political views. Both men — whose past actions and views toward women elicited strong criticism — withdrew from consideration after congressional opposition made it clear that neither would win Senate confirmation.

Ms. Shelton is a former Trump campaign adviser and transition team member who has been an outspoken advocate for the president’s policies and a critic of current Fed policy. She has held court at the Trump hotel in Washington in recent months, meeting with news organizations, lauding the administration’s trade war with China and making a case for cutting interest rates.