By Tamas Csonka in Budapest Hungary’s radical rightwing leader Viktor Orban is facing his biggest political crisis since taking office in 2010 following the resignation of President Katalin Novak and former justice minister Judit Varga over a scandal involving the pardon of a man convicted of covering up a sexual abuse case in a children’s home. House Speaker Laszlo Kover will assume the role of president until parliament approves the next head of state. In a potentially ironic turn of events, it could be up Orban’s most vocal anti-EU and anti-American cadre who signs the ratification of Swede…