Trump spoke at an event hosted by the Iowa Renewable Fuels Association.
Hillary Clinton has accused Bernie Sanders of voting "to let guns go onto the Amtrak."
The study says states are too focused on "new and wider highways" that aren't needed.
DOT officials want to ditch a safety rating system that has been in place since 1982.
Automakers and regulators have been under fire for a series of recalls.
The GOP presidential candidate said overseas profits should be taxed at an 8.75 percent rate.
There is no indication the technical troubles are linked to hackers.
Scott Darling has been serving as acting chief since the summer of 2014.
It's Jeff Shockey's third time through the revolving door.
New restrictions were put in place after last month shootings in San Bernandino, Calif. and Paris.
The state's Air Resources Board said VW's fixes "contain gaps and lack sufficient detail."
The expedited screening program was established in 2011.
GOP leaders have called for a new nongovernmental agency that would take over air traffic control.
The bus was traveling on U.S. Highway 101 in the San Jose area when it flipped on its side.
Tech groups fear a patchwork of state laws could stifle development.
The president is expected to highlight the turnaround in the U.S. auto industry.
"We need more jobs and we need good jobs," Clinton says.
The money will "accelerate the development and adoption of safe vehicle automation."
The NTSB included the technology in its 2016 "Most Wanted" list.
The legislation would lift some hurdles for dual nationals.
The American Beverage Institute said the proposed lower alcohol limit is "ridiculous."
The recommendations are included on the agency's 2016 "Most Wanted" list.
There was only one mention of road and transit spending during the speech.
The passengers were trapped on a smoke-filled train last January.