Puget Sound at sunset in October 2014. Image: Lindley Ashline / Flickr

Interior secretary Ryan Zinke's announcement last month that the federal government would open up coastal waters to offshore oil and gas drilling has left state lawmakers scrambling to protect Washington from the administration's plans.

Washington attorney general Bob Ferguson on Monday sent a letter to Zinke requesting that President Donald Trump rule out Washington's coasts from expanded access to offshore drilling. And Ferguson threatened to sue if the federal government didn't abide by that request.

Trump last month said he would exempt Florida from those plans after Republican governor Rick Scott adamantly opposed the policy, which would expand energy companies' access to lease sales on coastal lands. (Whether the companies would be interested in that land is another question; here's a Q&A by KUOW.)

In his letter, Ferguson wrote that dropping Florida from the plan, and not Washington, without established criteria would violate processes "states rely on for fair and lawful treatment." He said the coasts are also critical to the four coastal tribes that have treaties with the U.S.

Oil and gas exploration would "put at risk the livelihoods of tens of thousands of Washingtonians" who work in the fishing or tourism industries, Ferguson said.

U.S. senator Patty Murray last month also prompted a social media campaign for Washingtonians to tweet out photos of the Pacific coast to show what's at stake. The results:

Beautiful Puget Sound. Offshore drilling affects this fragile ecosystem too. pic.twitter.com/4qY0QS073B — MedTek (@medtek) January 12, 2018

La Push, WA. We're fighting for these views and the coastal economies that surround them. pic.twitter.com/NqFHoERBTZ — Sen. Maria Cantwell (@SenatorCantwell) January 12, 2018

Such a beautiful thread showcasing our one and only Pacific Northwest coastline - thank you Senator Murray. Here's looking out from Lopez Island. #ProtectOurCoast from offshore drilling, @SecretaryZinke. pic.twitter.com/ziD7c6jKUf — Rep. Pramila Jayapal (@RepJayapal) January 12, 2018

Kalaloch. Please don’t let oil companies destroy our state’s beautiful coast! pic.twitter.com/WCAMnHPus7 — JW (@jaydubveedub) January 12, 2018

Not only would a spill be devastating to the ecology our beautiful and pristine coastlines in Washington, it would devastate important industries like tourism, fishing, and seafood farming and disrupt the operation of vital ports and naval bases. Photo overlooking Port Angeles. pic.twitter.com/lRq4Wa0LAe — Haley Lindsey (@ham_linds) January 12, 2018

My beautiful hometown beach in Edmonds. Thank you @GovInslee @PattyMurray @SenatorCantwell @RepDelBene for speaking out loud & clear — no offshore drilling here. pic.twitter.com/7OvT9h9NWJ — Casey Katims (@caseykatims) January 12, 2018