Voters believe President Trump is overreaching with his aggressive efforts to expand executive power, and they have deep doubts about some of the signature pieces of his agenda, a New York Times/Siena College poll found.

The turbulent early months of Mr. Trump’s administration are seen as “chaotic” and “scary” by majorities of voters — even many who approve of the job he is doing. Voters do not view him as understanding the problems in their daily lives and have soured on his leadership as he approaches his 100th day in office.

Mr. Trump’s approval rating sits at 42 percent. His standing is historically low for a president this early in a term, but it is in line with his stubborn unpopularity, which did not prevent him from sweeping the battleground states in last year’s election.

Now, however, voters express dimming confidence about Mr. Trump’s handling of some of the top issues that propelled him back to the White House, including the economy and immigration, even as most Americans support deportations. Only 43 percent said they approved of how he has managed the economy this term, a serious erosion on an issue long seen as a strength.

The president’s pursuit of widespread tariffs — which has caused stock-market drops and gyrations — was opposed by 55 percent of voters, including 63 percent of independents.

Taken together, the survey’s findings show that any second-term honeymoon for Mr. Trump is over. His approval rating among crucial independent voters is now at a woeful 29 percent.