Stock trading halted for 15 minutes after the S&P 500 cratered 7 percent immediately after the open. Stacey Cunningham, president of the NYSE, joins CNBC's Bob Pisani and "Squawk on the Street" to discuss.

The massive sell-off triggered a key market circuit breaker minutes after the opening bell. Trading was halted for 15 minutes until reopening at 9:49 a.m. ET. The sharp declines on Monday followed a roller-coaster week that saw the S&P 500 swing up or down more than 2.5% for four days straight.

Investors continued to seek safer assets amid additional fears that the coronavirus will disrupt global supply chains and tip the economy into a recession. The yield on the benchmark 10-year Treasury note dropped below 0.5% for the first time ever, while the 30-year rate breached 1%. At one point early Monday, the 10-year slid to 0.318%.

Much of Monday’s anxiety came after Saudi Arabia on Saturday slashed official crude selling prices for April in a sudden U-turn from previous attempts to support the oil market. The move came after OPEC talks collapsed Friday, prompting some strategists to see oil prices crater to $20 per barrel this year.

“Crude has become a bigger problem for markets than the coronavirus,” Adam Crisafulli, founder of Vital Knowledge, said Sunday. “It will be virtually impossible for the [S&P 500] to sustainably bounce if Brent continues to crater,” he added.

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