Harley-Davidson Motor Company

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President Donald Trump and Vice President Mike Pence admire several Harley Davidson bikes on the South Lawn driveway of the White House in Washington, D.C. President Trump hosted a lunch for Harley Davidson executives, as well as union representatives for machinist and steel workers, in the Roosevelt Room of the White House in Washington, D.C., Thursday, February 2, 2017. (Official White House Photo by Shealah Craighead)

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FILE - In this Feb. 2, 2017, file photo, President Donald Trump, flanked by then-Commerce Secretary-designate Wilbur Ross, left, and Harley Davidson President and CEO Matt Levatich, talks to media before a lunch meeting with Harley Davidson executives and union representatives in the Roosevelt Room of the White House in Washington. Trump says labor unions have an open door to his White House, but so far, he is holding it a little more ajar for some organizations than others. Trump has put out the welcome mat for the nations construction trades, with whom hes had relationships during decades of building office towers and hotels. Also invited in have been auto, steel and coal workers who backed him during the 2016 election. But theres been no White House invitation for other unions representing the nations sprawling _ but shrinking _ pool of 14.6 million workers who collectively bargain with employers in the labor movement. (AP Photo/Carolyn Kaster, File)

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President Donald Trump and Vice President Mike Pence meet with Harley Davidson executives and Union Representatives on the South Lawn of the White House in Washington, Thursday, Feb. 2, 2017. (AP Photo/Pablo Martinez Monsivais)

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President Donald Trump and Vice President Mike Pence greet Harley Davidson President and CEO Matthew S. Levatich on the South Lawn of the White House in Washington, Thursday, Feb. 2, 2017. (AP Photo/Pablo Martinez Monsivais)

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President Donald Trump and Vice President Mike Pence stop to admire a Harley Davidson motorcycle parked on the South Lawn of the White House in Washington, Thursday, Feb. 2, 2017, as he welcomed Harley Davidson executives and union representatives. (AP Photo/Pablo Martinez Monsivais)

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Harley Davidson motorcycle.

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Gov. Scott Walker rides his 2003 Harley Davidson Road King (image from Gov. Scott Walker)

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Sen. Joni Ernst, shown here on her prized Harley Davidson, will lead a 40-mile motorcyle ride on Saturday - joined by Gov. Scott Walker and Rick Perry. (Image from Sen. Joni Ernst)