By Hannah Lang (Reuters) -A bipartisan group of U.S. lawmakers is urging the Biden administration to swiftly crack down on the use of cryptocurrencies by Hamas and its affiliates following the Palestinian militant group’s deadly attack in Israel earlier this month. A letter sent on Tuesday to the U.S. Treasury Department and the White House from 105 lawmakers led by Senators Elizabeth Warren, Roger Marshall and Representative Sean Casten, expressed “grave concern” that Hamas and an affiliated group called Palestinian Islamic Jihad were using digital assets to fund their operations and evade U….