US Secretary of State John Kerry made a brief, unan**unced trip to Tunisia Tuesday to back the transition to democracy in the **rth African country that spawned the Arab Spring. His visit came amid troubled relations between the United States and longtime ally Egypt over the military overthrow of the Islamist government elected there in the aftermath of the 2011 uprisings that shook the Arab world. Tunisia's agreement earlier this year on a consensus government and a new constitution three years after the ouster of veteran dictator Zine El Abidine Ben Ali has been hailed as a model by Western governments uncomfortable about events in Egypt. Kerry met President Moncef Marzouki and caretaker Prime Minister Mehdi Jomaa, who formed a cabinet of independents in January after a months-long political crisis ignited by the assassination of two secular politicians.