A group of four senators led by Sen. Barbara BoxerBarbara Levy BoxerBottom line Polls show big bounce to Biden ahead of Super Tuesday Sanders poised for big Super Tuesday MORE (D-Calif.) are calling for the resignation of Environmental Protection Agency Administrator Stephen Johnson, saying that he gave misleading testimony to a Senate committee.

Johnson told the Senate Environment and Public Works Committee in January that he had denied a waiver to California that would have allowed it to enact its own fuel efficiency standards because the state failed to meet necessary criteria. But Boxer and three other senators said Wednesday that Johnson's testimony conflicted with that of an aide, who said that the waiver was denied partly because President Bush opposed it.

Boxer, chairwoman of the Senate Envionment and Public Works Committee, had supported the California standards, which are stricter than federal ones. She again chastised Johnson Tuesday for his decision.

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"He has become a secretive and dangerous ally of polluters, and we cannot stand by and allow more damage to be done," she said in a statement. "We have lost all confidence in Stephen Johnson's ability to carry out EPA's mission in accordance with the law. I call on Administrator Johnson to immediately resign his position."

Sens. Amy KlobucharAmy KlobucharSenate Democrats demand answers on migrant child trafficking during pandemic Senate Democrats push to include free phone callsĀ for incarcerated people in next relief package Lobbying world MORE (D-Minn.), Sheldon WhitehouseSheldon WhitehouseSenate Democrats demand answers on migrant child trafficking during pandemic Democrats seek to exploit Trump-GOP tensions in COVID-19 talks Liability shield fight threatens to blow up relief talks MORE (D-R.I.), and Frank Lautenberg (D-N.J.) joined Boxer's call for Johnson to step down.

The four Democrats and Sen. Bernie SandersBernie SandersOn The Money: Pessimism grows as coronavirus talks go down to the wire | Jobs report poised to light fire under COVID-19 talks | Tax preparers warn unemployment recipients could owe IRS Senators introduce bill to block Trump armed drone sale measure Sanders offers bill to tax billionaires' wealth gains during pandemic MORE (I-Vt.) have also asked for a federal probe into whether Johnson's testimony was false or misleading. Download their letter to Attorney General Michael Mukasey here.