Former Vice President Joe Biden has strengthened his standing in several states critical to determining the outcome of the 2020 White House race, according to new surveys, as President Donald Trump falls further behind in the very battlegrounds that helped propel him to office in 2016.

The latest results of a series of New York Times/Siena College polls released Thursday represent another boon for the Biden campaign, which has enjoyed commanding leads over Trump in surveys of voters nationwide but remained locked in closer contests with the president's reelection effort in the swing states he wrestled from Hillary Clinton four years ago.

Across a half-dozen key states where Trump prevailed in 2016 - Arizona, Florida, Michigan, North Carolina, Pennsylvania and Wisconsin - the president now trails Biden by an average of 9 percentage points, an increase from Biden's 2-point average advantage in those states in October.

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