OnPolitics Today: What in the Sam Nunberg? Ex-Trump aide suggests collusion in interviews

And the rest of Monday's biggest politics news.

with Josh Hafner OnPolitics Today: What in the Sam Nunberg? Ex-Trump aide suggests collusion in interviews It was a doozy of a day for Sam Nunberg. The ex-Trump campaign aide, in a series of interviews on Monday, suggested Russia special counsel Robert Mueller may have a case against President Trump and that former Trump adviser Carter Page may have colluded with Russians. On top of that, Nunberg said he himself would defy a Mueller subpoena seeking his emails to a slew of former Trump advisers. Nunberg, who was fired from Trump's campaign in 2015, called Mueller's request "ridiculous."  "And you know what?" he said on CNN, "Trump may have very well done something during the election with the Russians." This is OnPolitics Today: Subscribe here. It's Trump against Ryan on tariffs Trump vowed Monday to push ahead with his proposed steel and aluminum tariffs, despite House Speaker Paul Ryan warning him they could "jeopardize" America's economic gains. "We're not backing down," Trump said Monday, claiming cheap metals out of China have hurt blue-collar steel jobs in the states. Here's how all that could shake out, including which countries - looking at you, China and Canada - have already threatened tariffs in response. "We are extremely worried about the consequences of a trade war and are urging the White House to not advance with this plan," a spokeswoman for Ryan said. DREAM on: Trump wanted DACA to die Monday. It didn't. Now what? Protections were set to run out Monday for about 700,000 undocumented immigrants brought to the U.S. as children, per a March 5 date set by Trump last fall. A Supreme Court ruling upended all that, pushing back the date as much as a year. Still present, though, are DREAMers' anxieties: Immigrants and their allies held demonstrations nationwide on Monday to make sure their plight stays in the spotlight. Republicans lead both chambers of Congress but have been unable to pass any DACA-related bill.  Elsewhere in politics • Citing health, GOP Sen. Thad Cochran will retire • Three billboards outside Orlando aim to stop Trump cuts • Washington state bans gay conversion therapy on minors • Should the law treat dogfighting like child abuse? • South Korea meets with Kim Jong Un, but don't hold your breath   MOST SHARED USA TODAY STORIES Steve Montenegro concedes in GOP primary for Arizona seat after texting scandal Debbie Lesko had a comfortable lead in unofficial returns for the the... Read more Continued after advertisement OnPolitics Today: Are you aware that we're making history? Also: House Speaker Paul Ryan rejects calls for tighter gun... Read more VA Secretary David Shulkin says he learned 'lots of lessons' from handling of travel report "Putting the agency in a position where we've had this distraction is... Read more Vt. bill would empower towns to limit marijuana odor Will legal marijuana lead to more disputes between neighbors? Bill in... Read more Washington Legislature bans gay conversion therapy on minors The bill would deem it "unprofessional conduct" for a licensed health... Read more FOLLOW US Thank you for subscribing to On Politics. Unsubscribe  |  Manage subscriptions  |  Privacy Policy/Your California Privacy Rights  |  Ad Choices  |  Terms of Service © 2018 USA TODAY, a division of Gannett Satellite Information Network, LLC. 7950 Jones Branch Drive, McLean, VA 22102