Erika Anderson, recruiter for Construction Careers Now! talks to job seekers at the Construction Careers Now! hiring event in Denver, Colorado U.S. August 2, 2017. REUTERS/Rick Wilking

Job seeker Jose Alvarez (L) talks with Emily Harp, Human Resources Specialist for the Colorado Department of Transportation at the Construction Careers Now! hiring event in Denver, Colorado U.S. August 2, 2017. REUTERS/Rick Wilking

A recruiter talks with a job seeker at the Construction Careers Now! hiring event in Denver, Colorado U.S. August 2, 2017. REUTERS/Rick Wilking

Job seeker Kiefer Bennett (R) shakes hands with Jayhawk Owens, project manager for Baker Concrete Construction at the Construction Careers Now! hiring event in Denver, Colorado U.S. August 2, 2017. REUTERS/Rick Wilking

Emily Harp, Human Resources Specialist for the Colorado Department of Transportation, speaks to a job seeker at the Construction Careers Now! hiring event in Denver, Colorado U.S. August 2, 2017. REUTERS/Rick Wilking

Brochures are displayed for job seekers at the Construction Careers Now! hiring event in Denver, Colorado U.S. August 2, 2017. REUTERS/Rick Wilking

Erika Anderson, recruiter for Construction Careers Now! talks to job seekers at the Construction Careers Now! hiring event in Denver, Colorado U.S. August 2, 2017. REUTERS/Rick Wilking

Erika Anderson, recruiter for Construction Careers Now! talks to job seekers including Richard Horst (background) at the Construction Careers Now! hiring event in Denver, Colorado U.S. August 2, 2017. REUTERS/Rick Wilking

Job seekers attend a job fair sponsored by the employment website Monster.com as part of their "Keep America Working" tour at a hotel in New York's Times Square, March 5, 2009.Thousands of job seekers attended the event featuring more than 90 employers. REUTERS/Mike Segar (UNITED STATES)

Job seekers speak to employers at a job fair sponsored by employment website Monster.com as part of their "Keep America Working" tour at a hotel in New York's Times Square, March 5, 2009. Thousands of job seekers attended the event featuring more than 90 employers. REUTERS/Mike Segar (UNITED STATES)

Roger Plainfield of New Jersey (L) speaks to a recruiter at a job fair sponsored by employment website Monster.com as part of their "Keep America Working" tour at a hotel in New York's Times Square, March 5, 2009.Thousands of job seekers attended the event featuring more than 90 employers. REUTERS/Mike Segar (UNITED STATES)

People wait in line for a job fair sponsored by employment website Monster.com as part of their "Keep America Working" tour at a hotel in New York's Times Square, March 5, 2009. Thousands of job seekers attended the event featuring more than 90 employers. REUTERS/Mike Segar (UNITED STATES)

A display of employment tips pamphlets waits for job seekers at a job fair sponsored by employment website Monster.com as part of their "Keep America Working" tour at a hotel in New York's Times Square, March 5, 2009. Thousands of job seekers attended the event featuring more than 90 employers. REUTERS/Mike Segar (UNITED STATES)

People wait in line for a job fair sponsored by employment website Monster.com as part of their "Keep America Working" tour at a hotel in New York's Times Square, March 5, 2009. Thousands of job seekers attended the event featuring more than 90 employers. REUTERS/Mike Segar (UNITED STATES)

People wait in line for a job fair sponsored by employment website Monster.com as part of their "Keep America Working" tour at a hotel in New York's Times Square, March 5, 2009. Thousands of job seekers attended the event featuring more than 90 employers. REUTERS/Mike Segar (UNITED STATES)

U.S. Border Patrol agent Walter Hardwell (back) speaks to a job seeker at a job fair sponsored by employment website Monster.com as part of their "Keep America Working" tour at a hotel in New York's Times Square, March 5, 2009. Thousands of job seekers attended the event featuring more than 90 employers. REUTERS/Mike Segar (UNITED STATES)

Job seekers crowd a job fair sponsored by employment website Monster.com as part of their "Keep America Working" tour at a hotel in New York's Times Square, March 5, 2009. Thousands of job seekers attended the event featuring more than 90 employers. REUTERS/Mike Segar (UNITED STATES)

A job seeker listens to a recruiter from the New York City Department of Health at a job fair sponsored by employment website Monster.com as part of their "Keep America Working" tour at a hotel in New York's Times Square, March 5, 2009. Thousands of job seekers attended the event featuring more than 90 employers. REUTERS/Mike Segar (UNITED STATES)

A man holds pamphlets as he waits at a job fair sponsored by employment website Monster.com as part of their "Keep America Working" tour at a hotel in New York's Times Square, March 5, 2009. Thousands of job seekers attended the event featuring more than 90 employers. REUTERS/Mike Segar (UNITED STATES)

People wait on line for a job fair sponsored by employment website Monster.com as part of their "Keep America Working" tour at a hotel in New York's Times Square, March 5, 2009. Thousands of job seekers attended the event featuring more than 90 employers. REUTERS/Mike Segar (UNITED STATES)

People crowd a job fair sponsored by employment website Monster.com as part of their "Keep America Working" tour at a hotel in New York's Times Square, March 5, 2009. Thousands of job seekers attended the event featuring more than 90 employers. REUTERS/Mike Segar (UNITED STATES)

People wait on line for a job fair sponsored by employment website Monster.com as part of their "Keep America Working" tour at a hotel in New York's Times Square, March 5, 2009. Thousands of job seekers attended the event featuring more than 90 employers. REUTERS/Mike Segar (UNITED STATES)

People wait on line for a job fair sponsored by employment website Monster.com as part of their "Keep America Working" tour at a hotel in New York's Times Square, March 5, 2009.Thousands of job seekers attended the event featuring more than 90 employers. REUTERS/Mike Segar (UNITED STATES)