Key Democratic lawmakers are breaking with President Joe Biden over the controversial decision to send cluster bombs to Ukraine, arguing that providing the weapons, which are banned by more than 120 countries, cedes the moral high ground and will end up indiscriminately killing civilians. Top Democrats on the House Rules Committee and the panels that fund the Pentagon and State Department lashed out in rare public statements broadcasting their break with their party’s president. “The decision by the Biden administration to transfer cluster munitions to Ukraine is unnecessary and a terrible mistake,” said Rep. Betty McCollum (D-Mo.), the ranking member...