Ryan Blaney criticizes Chase Briscoe's mirror driving at Iowa, sparking debate on NASCAR's rear-view mirror tactics.

Chase Briscoe has shown blistering speed in his first season in the No. 19 Joe Gibbs Racing Toyota on all sorts of venues. On Saturday at Iowa Speedway, a 0.875-mile short track, Briscoe won his sixth pole of the season with a lap at 136.

NEWTON, Iowa — Chase Briscoe is starting on the pole for Sunday’s NASCAR Cup Series race at Iowa Speedway. Finishing up front on a regular basis is his next goal. Briscoe won his sixth pole position of the season during Saturday’s qualifying, running a lap of 136.933 mph. Despite his qualifying success this season, he has just one win this year.