WASHINGTON (AP) —
    Immigration activists are trying to use Hillary Rodham Clinton's stance on immigration to pressure President Barack Obama to do more for immigrants.
    Clinton said last week that if elected president, she would expand on the executive actions Obama took last fall to grant legal work permits to millions of immigrants in this country illegally.
    The White House insists that Obama went as far as he legally could. But Clinton said she would do more than her fellow Democrat, including extending deportation protections to the parents of so-called "Dreamers" — immigrants brought illegally to this country as youths.
    Activists with the #Not1More Campaign said Monday they are sending a letter to the White House urging Obama to follow Clinton's lead.
    "President Obama could make the changes to the immigration enforcement system outlined by Clinton, now," said the letter provided to The Associated Press. "If Hillary Clinton and the Democratic Party believe in these changes as more than talking points, they should move for President Obama to enact them immediately with the urging and vocal support of his party."
    Immigration is emerging as an important issue in the presidential campaign, with Clinton using it to differentiate herself from her Republican opponents, who oppose the unilateral steps Obama took.
    But Clinton's comments also opened a split with the current president of her own party, one that immigration activists hope to use to their advantage.
    White House press secretary Josh Earnest, when asked about Clinton's comments, said that Obama had already gone as far as he could.
    "The president was determined to use as much of his authority as he could to try to bring some much needed accountability to our broken immigration system. And that was reflected in the announcement that he made," Earnest said.
    The activists' letter also pointed to comments Clinton made questioning conditions in immigrant detention centers, and urged Obama to end detentions of vulnerable populations including pregnant women and transgender people.
    Obama's executive actions have been challenged in court and are currently on hold pending a ruling by the 5th U.S. Circuit Court of Appeals.
    On Monday, a group of House members and senators announced they were filing an amicus brief to support a continued injunction against the executive actions. Signers included GOP Sens. Ted Cruz of Texas and Marco Rubio of Florida, both presidential candidates. A third senator running for president, Rand Paul of Kentucky, did not sign.