The release from house arrest of Hafiz Saeed, L, on Friday led to a U.S. State Department statement calling for his arrest.
The White House press secretary said LeT is a designated Foreign Terrorist Organisation responsible for the deaths of hundreds of innocent civilians in terrorist attacks, including a number of American citizens.
Earlier in the day, the LeT Chief Hafiz Muhammad Saeed was released from house arrest, two days after the Lahore High Court (LHC) rejected the Punjab government's request to extend his detention.
"If Pakistan does not take action to lawfully detain Saeed and charge him for his crimes, its inaction will have repercussions for bilateral relations and for Pakistan's global reputation", Sanders said in a statement, reflecting the Trump administration's outrage at Saeed's release.
Hafiz Saeed also targeted the Pak govt for "taking dictation from foreign masters".
Saeed was designated as a Specially Designated Global Terrorist under Executive Order 13224 by the United States Department of the Treasury in May 2008.
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According to the AP, Raveesh Kumar, a spokesman for India's External Affairs Ministry, said Saeed's release "confirms once again the lack of seriousness on the part of Pakistani government in bringing to justice perpetrators of heinous acts of terrorism". In 2010, he told The Independent: "They make me out to be the biggest and most evil terrorist".
Pakistani authorities on Friday released the alleged mastermind of the 2008 Mumbai terror attacks who has a $10 million USA bounty on his head.
Saeed blamed India for his incarceration in Pakistan, saying "Pakistan's rulers detained me on the aspiration of Modi due to their friendship with him". They say that while Jamaat-ud-Dawa may indeed perform charitable activities, it is also a front for Lashkar-e-Taiba, the Pakistan militant group which became notorious for strikes on Indian targets, including a 2001 attack on its parliament in Delhi. His situation under house arrest is not irksome; Mr Saeed has a large property in Lahore and is protected not only by his own armed guards but by armed police officers.
"Nawaz Sharif asks why he was ousted?" India and the U.S. said there was sufficient evidence, though this was something prosecutors in Pakistan denied.
Pakistan denies that. While Saeed was under house arrest, his JuD charity launched a political party, the Milli Muslim League (MML), which has won thousands of votes in by-elections.
Saeed, right after his release had said that he will continue to work for the cause of Kashmir. That came about after Pakistani military's purported rescue of American hostage Caitlan Coleman and her family after five years of Taliban captivity.