Democratic frontrunner Hillary Clinton has been a US presidential candidate for seven weeks, but her campaign officially launches June 13 with a rally on a New York City island.
The centre-left party of Italian premier Matteo Renzi faced battles in regional elections, exit polls showed, after balloting which is also seen as a measure of the fading fortunes of ex-leader Silvio Berlusconi.
Maryland ex-governor Martin O'Malley is all but certain to unveil his White House campaign, amid debate about whether he is a viable contender or merely a foil for Democratic front-runner Hillary Clinton.
British Prime Minister David Cameron's Conservatives unveil their programme for government after a surprise clear win at this month's general election.
Polish voters have opted for change and chosen the conservative and relatively unknown lawyer Andrzej Duda as their next president, spelling a possible return to power of his eurosceptic mentor.
Andrzej Duda, the 43-year-old conservative MEP and lawyer who won Poland's cliffhanger presidential election on Sunday, has strong ties to the powerful Kaczynski twins.
Ireland waited Saturday to learn the outcome of a historic referendum on same-sex marriage, with crowds of anxiously optimistic "Yes" supporters expected at Dublin Castle to hear the result.
Nursultan Nazarbayev has sent a telegram to the leader of the Conservatives Party David Cameron congratulating him on the win of his party in the UK parliamentary elections.
Democratic presidential frontrunner Hillary Clinton called Tuesday for a path to citizenship for some of the 11 million illegal immigrants in the United States.
Italy's lower house of parliament is due to take a final vote on a bill to radically overhaul the electoral system aimed at ending decades of political instability.