Per Miranda Devine, the House Oversight Committee has subpoenaed FBI Director Christopher Wray for an FBI FD-1023 form that, according to a whistleblower, documents a bribe paid to Joe Biden, as vice president, by a representative of a foreign power.
Further, Senator Charles Grassley and Congressman James Comer sent this letter to Attorney General Merrick Garland and Director Wray earlier today:

The foreign country is said not to be China.
The lack of confidence expressed by Grassley and Comer, not just in DOJ–not surprising, in a Democratic administration–but also in the FBI, is stunning.
These are Devine’s tweets:
— Miranda Devine (@mirandadevine) May 3, 2023
It is worth noting that no one doubts that bribery is a proper ground for impeachment.