Tesla Inc's shares also fell to a two-day low and wiped out all the gains fuelled by Chief Executive Elon Musk's recent tweet announcing a plan to take the company private. The S&P technology index fell 0.8 per cent, with Intel down 2.6 per cent after Goldman Sachs downgraded the stock to "sell".
Stocks traded little changed on Thursday as the S&P 500 was within striking distance of reaching an all-time high.
The technology sector has been at the center of a sharp recovery in US stocks since a market rout in February.
The Toronto Stock Exchange's S&P/TSX fell 90.47 points, or 0.55 per cent, to 16,326.51, led lower by the health care, consumer staples and utilities sectors.
The S&P 500 is up 13.23 points, or 0.5 per cent.
Microchip Technology shares fell 10.9 per cent after a disappointing second-quarter revenue forecast.
GOP schedules Supreme Court hearings, outraging Democrats
Leading Democrats in the Senate immediately questioned Republicans' motives for the timing of the confirmation hearing. But Democrats want access to more documents from Kavanaugh's past as a judge and as an official in the George W.
S&P 500 e-minis (ESc1) were up 1.25 points, or 0.04 percent and Nasdaq 100 e-minis (NQc1) were up 3.25 points, or 0.04 percent.
The number of Americans filing for unemployment benefits unexpectedly fell last week, suggesting that a strong economy was helping the labor market counter ongoing trade tensions.
Eight of the 11 major S&P sectors were higher.
Rite Aid fell 9.5 percent and was the most actively traded stock after the drug store chain and US grocer Albertsons Cos agreed to terminate their merger agreement. Meanwhile, newly announced USA sanctions against Russian Federation added to the turmoil.
Rite Aid (RAD.N) fell 10.6 percent and was the most actively traded stock after the drug store chain and USA grocer Albertsons Cos ABS.N agreed to terminate their merger agreement.
Declining issues outnumbered advancing ones on the NYSE by a 1.04-to-1 ratio; on Nasdaq, a 1.10-to-1 ratio favoured advancers. Excluding the energy sector, the earnings growth estimate declines to 20.4 per cent.