U.S. stock finished lower on Friday as investors to took a cautious stance ahead of Sunday's French presidential election.

U.S. stocks and the benchmark treasury yield briefly cut their losses on Friday

after Donald Trump said he would deliver a plan for "massive tax cuts" on Wednesday or shortly after.

However, the S&P 500 finished the day down 0.3 percent,

but managed to clock a weekly gain of 0.9 percent, its first weekly gain in three.

The week was dominated by geopolitical developments with U.K. prime minister Theresa May calling for a general election in June.

But with the French elections taking center stage,

the latest polls conducted before Thursday's attack in Paris showed the first round due Sunday is too close to call.

Meanwhile, oil clocked its biggest weekly drop since early March with Friday sale-off

taking WTI, the U.S. crude benchmark, below $50 dollars a barrel,

while Brent briefly slid below $52 a barrel.

The decline came as confidence in OPEC's ability to overpower resurgent U.S. shale industry weakened.