Washington (CNN) Republican Sen. Joni Ernst was confronted by an Iowan constituent on Thursday over her "silence" and for "not standing up" to President Donald Trump over his recent call for Ukraine and China to investigate the Bidens.

The voter, identified by Iowa Starting Line as Amy Haskins, raised concerns during a town hall in Templeton, Iowa, over Iowa farmers struggling from the US trade war with China and expressed frustration with Trump's focus on former Vice President Joe Biden and his son, Hunter Biden.

"How is that helping anybody?" Haskins said to some applause from the audience, adding later, "We get everything else except what we really need to know and what we really need (Trump) to do."

Haskins, a resident from Manning, Iowa, who identified herself as an independent voter, then asked Ernst, "Where is the line? When are you guys going to say enough and stand up and say, 'You know what? I'm not backing any of this.'"

"You still stand there silent. And your silence is supporting him in not standing up," she said to the Iowa senator. "You, yourself, served. You didn't pledge an oath to the President. You pledged it to our country, you pledged it to our Constitution. When are you guys going to start standing up and actually be there for us?"

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