By Max Matza
BBC News
A US tax special agent has information about how a criminal investigation into the son of US President Joe Biden has been hampered by "political considerations", says his lawyer.
The attorney for the unnamed agent says his client is seeking whistleblower protections from Congress to speak out.
He says the agent alleges "preferential treatment and politics improperly infecting decisions" in the probe.
A White House official denied Mr Biden had meddled in the probe into his son.
Congressional Republicans are investigating whether Hunter Biden improperly used family ties in his business dealings.
Mark Lytle, a lawyer representing the employee of the Internal Revenue Service (IRS) tax agency, wrote to a bipartisan group of lawmakers on Wednesday.
He said he represents a "career IRS Criminal Supervisory Special Agent who has been overseeing the ongoing and sensitive investigation of a high profile, controversial subject since early 2020".
The employee is prepared to "contradict sworn testimony to Congress by a senior political appointee", and reveal "clear conflicts of interest" and "preferential treatment and politics improperly infecting decisions and protocols", the letter states.
"My client wants to come forward to Congress," Mr Lytle told CBS News.
"He's ready to be questioned about what he knows and what he experienced under the proper legal protections."
The lawyer added that his client was limited...
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