WASHINGTON | President Donald Trump had been hearing the message loud and clear for weeks about the sweeping cryptocurrency bill being written in the Senate: to get it across the line, he would have to agree to ethics provisions that apply to him, too.

First, Trump agreed to a measure that would bar him and his wife from issuing the types of meme coins that they swiftly launched as he prepared to return to the White House for a second time. And then another concession came late Sunday, when Republicans said Trump consented to a tougher ethics proposal that several key senators had demanded.

Now, a pivotal Senate vote on the cryptocurrency bill on Tuesday could mark a watershed moment for the $2.3 trillion…