US STOCKS-Wall St trims gains as Greece default looms
* Greece submits new aid proposal to creditors
* June U.S. consumer confidence rises more than expected
* Home prices rise slower than expected in April
* Indexes up: Dow 0.28 pct, S&P 0.36 pct, Nasdaq 0.61 pct (Adds comments, updates prices)
By Sweta Singh
June 30 (Reuters) - U.S. stocks gave up some of their gains in afternoon trading on Tuesday as investors remained on the edge, hoping for a last-minute deal to keep Greece in the euro.
Greece submitted a new aid proposal to its creditors, calling for debt restructuring in what seemed like a last-ditch effort by Athens to resolve its impasse with lenders.
The country is hours away from defaulting on a 1.6 billion euro ($1.8 billion) payment due to the International Monetary Fund, leaving global markets on tenterhooks.
Volatility picked up as Tuesday also marked the expiration of quarterly options. The U.S. Independence Day holiday, being observed on Friday, means the weekly options expiry is a day early this week. Continuación...