The Judiciary chairman says it would be difficult not to accept a meeting.
The vulnerable Republican said he wouldn't change his position on the seat remaining vacant.
The ad calls Republican Sen. Rob Portman "the ultimate Washington insider."
Freedom Partners Action Fund is launching a seven-figure attack ad campaign.
The former governor will go head-to-head against Sen. Rob Portman in November.
Both easily won their party's primaries on Tuesday.
The Illinois congresswoman will now go head-to-head with Republican Sen. Mark Kirk.
The new DSCC ad ties GOP senators up for reelection to Trump.
Challengers have captured major newspaper endorsements and pressed for accountability.
Timothy Cama 03/14/16 01:10 PM EDT
Three major environmental groups are backing Rep. Tammy Duckworth's Senate bid.