The letter comes after Trump suggested in April to about two dozen oil industry executives that they should give $1 billion to his ... you may have about quid pro quo financial agreements ...

where he asked oil executives to steer $1 billion to his campaign ... The senators voiced concern that Trump’s request at the dinner may have been a quid pro quo and may have violated campaign ...

One North Carolina newspaper, the Greensboro News and Record republished a May 10 Bloomberg column six days later that discussed Trump’s $1 billion ... s quid pro quo proposition to Big Oil ...