(CNN) - Ninety former U.S. national security officials wrote a letter Sunday praising the anonymous whistleblower whose recent complaint about President Donald Trump's communications with Ukraine touched off a firestorm, leading House Democrats to launch an impeachment inquiry into Trump.
As such, he or she has by law the rightand indeed the responsibilityto make known, through appropriate channels, indications of serious wrongdoing," the former officials wrote.
During a congressional hearing last month, Maguire said he was "absolutely committed" to protecting the whistleblower from retaliation, a point the former officials address in their letter.
"What's more, being a responsible whistleblower means that, by law, one is protected from certain egregious forms of retaliation.
On Sunday, Mark Zaid, the lawyer for the whistleblower, said he is representing a second whistleblower regarding Trump's actions.