Rep. Gabrielle Giffords remains in serious condition at a Tucson hospital. In the latest milestone of her recovery, Giffords was able to stand on her feet Wednesday with the aid of medical staff. Her office says she could be transferred to a Houston rehabilitation facility specializing in brain injuries as early as Friday. Giffords’ husband Captain Mark Kelly, meanwhile, has revealed she had long worried of being targeted at one of her public events. Kelly discussed Giffords’ fear in an interview with ABC’s Diane Sawyer.

Diane Sawyer: “Had you been worried for her safety?”

Mark Kelly: “Absolutely. Yes. And she was, too.”

Diane Sawyer: “Had there been death threats?”

Mark Kelly: “Yeah, she’s had death threats, as a lot of members of Congress have death threats. She’s had them before. You know, she says, you know, 'Someday, I'm really worried that somebody’s going to come up to me at one of these events with a gun.’”

Diane Sawyer: “She said that?”

Mark Kelly: “Oh, yeah. I mean, she said it — I mean, we’ve talked about it probably, you know, 10 times.”