Mr. Pompeo has notably steered clear of directly criticizing Antony J. Blinken, the current secretary of state, with whom he said he had a “productive” meeting in January before Mr. Biden’s inauguration.
But he has since repeatedly denounced policies in which Mr. Blinken plays a key role.
Last week, Mr. Pompeo tweeted that the Biden administration’s plans to restart aid to the Palestinians canceled under Mr. Trump were “immoral” and would support terrorist activity. “Americans and Israelis should be outraged by the Biden administration’s plans to do so,” Mr. Pompeo wrote.
But his commentary goes beyond foreign policy. Mr. Pompeo has also condemned Mr. Biden’s “backward” “open border” policies. And on March 19, he simply tweeted the number 1,327 — an apparent reference to the number of days until the 2024 election.
Mr. Pompeo appears to have a heightened sense of animosity toward Mr. Kerry, who is back in government as Mr. Biden’s climate czar. That appointment, in part, does “not bode well for American energy and for affordable energy here at home,” Mr. Pompeo said in Iowa.
And in a Feb. 22 appearance on Fox News, Mr. Pompeo unloaded on his predecessor over meetings Mr. Kerry had during the Trump years with Iran’s foreign minister, Mohammad Javad Zarif, which Mr. Pompeo called an “un-American” effort to undermine Mr. Trump’s foreign policy.
There is little sign that Mr. Pompeo’s criticism has struck a nerve among Biden officials and their allies. Asked about the remarks last month, a State Department spokesman, Ned Price, declined to respond directly but said the Biden and Trump administrations shared the goal of preventing Iran from acquiring a nuclear weapon.
“No one cares,” Ben Rhodes, a former deputy national security adviser to President Barack Obama, tweeted in response to a recent news report about a Pompeo critique of Mr. Biden’s policies.