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President Trump returning to the White House from Minnesota on Sept. 18. Photo: Win McNamee/Getty Images

A suspect was arrested for allegedly "sending a suspicious letter" after law enforcement agents intercepted an envelope addressed to President Trump containing the poison ricin, the FBI confirmed in an emailed statement to Axios Sunday.

Details: The suspect, a woman, was arrested while trying to enter New York from Canada, law enforcement sources said.

The big picture: The FBI and Secret Service are investigating after two tests confirmed the presence of the toxin following the interception of the mail earlier this week, CNN first reported.

  • All mail addressed to the White House is sorted and screened at an offsite facility before reaching the White House.
  • The Royal Canadian Mounted Police said in a statement it was assisting in the investigation after receiving a "request for assistance from the FBI in connection with a suspicious letter sent to the White House."

What else they're saying: "The FBI and our U.S. Secret Service and U.S. Postal Inspection Service partners are investigating a suspicious letter received at a U.S. government mail facility. At this time, there is no known threat to public safety," the FBI said in an earlier statement.

Go deeper

Wisconsin GOP says hackers stole $2.3 million from account meant to help Trump

Illustration: Aïda Amer/Axios

$2.3 million was recently stolen from a Wisconsin GOP account meant to aid President Trump's re-election campaign, Republican Party chairman Andrew Hitt told the AP on Thursday.

The big picture: Former Vice President Joe Biden is polling ahead in Wisconsin, which is a vital battle ground state in November's election. Although Trump won Wisconsin in 2016, Biden is currently favored to win the state in FiveThirtyEight's latest forecast.

Making sense of Biden's big emissions promise

Illustration: Sarah Grillo/Axios

President Biden's new U.S. emissions-cutting target is a sign of White House ambition and a number that distills the tough political and policy maneuvers needed to realize those aims.

Driving the news: This morning the White House unveiled a nonbinding goal under the Paris Agreement that calls for cutting U.S. greenhouse gas emissions by 50%-52% by 2030 relative to 2005 levels.

Biden pledges to cut greenhouse gas emissions by up to 52% by 2030

U.S. President Joe Biden seen in the Oval Office on April 15. (Photo by Doug Mills-Pool/Getty Images)

The Biden administration is moving to address global warming by setting a new, economy-wide greenhouse gas emissions reduction target of 50% to 52% below 2005 levels by 2030.

Why it matters: The new, non-binding target is about twice as ambitious as the previous U.S. target of a 26% to 28% cut by 2025, which was set during the Obama administration. White House officials described the goal as ambitious but achievable during a call with reporters Tuesday night.