By Renee Maltezou and Angeliki Koutantou ATHENS (Reuters) - Greek Prime Minister Alexis Tsipras tried to rally his leftwing Syriza party on Tuesday ahead of a vote in parliament on the second package of measures demanded by international creditors as a condition for opening talks on a new bailout deal. Tsipras has faced a revolt in the ruling Syriza party over the mix of tax hikes and spending cuts demanded by lenders but is expected to get the package through parliament with the support of pro-European opposition parties. Talking to Syriza officials on the eve of the vote, he said he aimed to seal the bailout accord, which could offer Greece up to 86 billion euros (£60 billion) in new loans to bolster its tottering finances and ward off the threat of a forced exit from the euro.