Here are some of the catalysts that led to Monday's sell-off

Stocks started the New Year with a sell-off as investors' concerns over virus spikes and the possibility of higher taxes if Democrats take the Senate grew. Julian Emanuel, chief equity and derivatives strategist at BTIG, and Megan Horneman, Verdence Capital Advisors director of portfolio strategy, joined "Squawk Box" on Tuesday to discuss what the sell-off might mean going forward.
Tue, Jan 5 20218:03 AM EST